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spectra.ncl @ 1842

Last change on this file since 1842 was 1559, checked in by heinze, 10 years ago
Changes to allow for using NCL version 6.2.1 and higher. Backward compatibility is also ensured.
File size: 24.6 KB

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1	load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
2	load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
3	load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
4
5	;***************************************************
6	; Checking the kind of the script
7	;***************************************************
8
9	function which_script()
10	local script
11	begin
12	script = "spectra"
13	return(script)
14	end
15
16	;***************************************************
17	; Retrieving the NCL version used
18	;***************************************************
19
20	ncl_version_ch = systemfunc("ncl -V")
21	ncl_version = stringtofloat(ncl_version_ch)
22
23	;***************************************************
24	; Function for checking file existence in dependence
25	; on NCL version
26	;***************************************************
27
28	function file_exists(version:string,file_name:string)
29	begin
30	if( version .EQ. "6.2.1" ) then
31	existing = fileexists(file_name)
32	else
33	existing = isfilepresent(file_name)
34	end if
35	return(existing)
36	end
37
38	;***************************************************
39	; load .ncl.config or .ncl.config.default
40	;***************************************************
41
42	file_name ="$PALM_BIN/../../.ncl.config"
43	existing_file = file_exists(ncl_version_ch,file_name)
44
45	if (existing_file) then
46	loadscript("$PALM_BIN/../../.ncl.config")
47	else
48	file_name = "$PALM_BIN/NCL/.ncl.config.default"
49	existing_file = file_exists(ncl_version_ch,file_name)
50	if (existing_file) then
51	loadscript( "$PALM_BIN/NCL/.ncl.config.default")
52	else
53	palm_bin_path = getenv("PALM_BIN")
54	print(" ")
55	print("Neither the personal configuration file '.ncl.config' exists in")
56	print("~/palm/current_version")
57	print("nor the default configuration file '.ncl.config.default' "+\
58	"exists in")
59	print(palm_bin_path + "/NCL")
60	print(" ")
61	exit
62	end if
63	end if
64
65	begin
66
67	;***************************************************
68	; Retrieving the double quote character
69	;***************************************************
70
71	dq=str_get_dq()
72
73	;***************************************************
74	; set up default parameter values and strings
75	;***************************************************
76
77	if (file_1 .EQ. "File in") then
78	print(" ")
79	print("Declare input file 'file_1=' in '.ncl.config' or prompt")
80	print(" ")
81	exit
82	else
83	file_in = file_1
84	end if
85
86	if (format_out .NE. "x11" .AND. format_out .NE. "pdf" .AND. \
87	format_out .NE. "eps" .AND. format_out .NE. "ps" .AND. \
88	format_out .NE. "epsi" .AND. format_out .NE. "ncgm" .AND. \
89	format_out .NE. "png")then
90	print(" ")
91	print("'format_out = "+format_out+"' is invalid and set to'x11'")
92	print(" ")
93	format_out="x11"
94	end if
95
96	if (ncl_version .LE. 5.1 .AND. format_out .EQ. "png") then
97	print(" ")
98	print("Output of png files not available")
99	print("png output is avaiable with NCL version 5.2.0 and higher ")
100	print("NCL version used: " + ncl_version_ch)
101	print(" ")
102	exit
103	end if
104
105	if (log_x .NE. 0 .AND. log_x .NE. 1)then
106	print(" ")
107	print("'log_x'= "+log_x+" is invalid and set to 1")
108	print(" ")
109	log_x = 1
110	end if
111
112	if (log_y .NE. 0 .AND. log_y .NE. 1)then
113	print(" ")
114	print("'log_y'= "+log_y+" is invalid and set to 1")
115	print(" ")
116	log_y = 1
117	end if
118
119	if (norm_y .EQ. 0.) then
120	print(" ")
121	print("Normalising with 0 is not allowed, 'norm_y' is set to 1.0")
122	print(" ")
123	norm_y = 1.0
124	end if
125	if (norm_x .EQ. 0.) then
126	print(" ")
127	print("Normalising with 0 is not allowed, 'norm_x' is set to 1.0")
128	print(" ")
129	norm_x= 1.0
130	end if
131
132	if (sort .NE. "height" .AND. sort .NE. "time") then
133	print(" ")
134	print("'sort'= "+sort+" is invalid and set to 'height'")
135	print(" ")
136	sort = "height"
137	end if
138
139	if (black .NE. 0 .AND. black .NE. 1)then
140	print(" ")
141	print("'black'= "+black+" is invalid and set to 0")
142	print(" ")
143	black = 0
144	end if
145
146	if (dash .NE. 0 .AND. dash .NE. 1)then
147	print(" ")
148	print("'dash'= "+dash+" is invalid and set to 0")
149	print(" ")
150	dash = 0
151	end if
152
153	;***************************************************
154	; open input file
155	;***************************************************
156
157	file_in_1 = False
158	if (isStrSubset(file_in, ".nc"))then
159	start_f = -2
160	end_f = -2
161	file_in_1 = True
162	end if
163
164	if (start_f .EQ. -1)then
165	print(" ")
166	print("'start_f' must be one of the cyclic numbers (at least 0) of "+\
167	"your input file(s)")
168	print(" ")
169	exit
170	end if
171	if (end_f .EQ. -1)then
172	print(" ")
173	print("'end_f' must be one of the cyclic numbers (at least 0) of "+\
174	"your input file(s)")
175	print(" ")
176	exit
177	end if
178
179	files=new(end_f-start_f+1,string)
180
181	if (file_in_1)then
182	if (isfilepresent(file_in))then
183	files(0)=file_in
184	else
185	print(" ")
186	print("1st input file: '"+file_in+"' does not exist")
187	print(" ")
188	exit
189	end if
190	else
191	if (start_f .EQ. 0)then
192	if (isfilepresent(file_in+".nc"))then
193	files(0)=file_in+".nc"
194	do i=1,end_f
195	if (isfilepresent(file_in+"."+i+".nc"))then
196	files(i)=file_in+"."+i+".nc"
197	else
198	print(" ")
199	print("Input file: '"+file_in+"."+i+".nc' does not exist")
200	print(" ")
201	exit
202	end if
203	end do
204	else
205	print(" ")
206	print("Input file: '"+file_in+".nc' does not exist")
207	print(" ")
208	exit
209	end if
210	else
211	do i=start_f,end_f
212	if (isfilepresent(file_in+"."+i+".nc"))then
213	files(i-start_f)=file_in+"."+i+".nc"
214	else
215	print(" ")
216	print("Input file: '"+file_in+"."+i+".nc' does not exist")
217	print(" ")
218	exit
219	end if
220	end do
221	end if
222	end if
223
224	f=addfiles(files,"r")
225	f_att=addfile(files(0),"r")
226	ListSetType(f,"cat")
227
228	vNam = getfilevarnames(f_att)
229	if( ncl_version .GE. 6.1 ) then
230	vNam = vNam(::-1)
231	end if
232	vType = getfilevartypes(f_att,vNam)
233
234	if ((all(vType .eq. "double"))) then ;distinction if data is double or float
235	check_vType = True
236	else
237	check_vType = False
238	end if
239
240	print(" ")
241	print("Variables in input file:")
242	print("- "+ vNam)
243	print(" ")
244	dim = dimsizes(vNam)
245	vDim = getfiledimsizes(f_att)
246
247	t_all = f[:]->time
248	nt = dimsizes(t_all)
249
250	if (nt .EQ. 1)then
251	delta_t=t_all(nt-1)/nt
252	else
253	delta_t_array = new(nt-1,double)
254
255	do i=0,nt-2
256	delta_t_array(i) = t_all(i+1)-t_all(i)
257	end do
258
259	delta_t = min(delta_t_array)
260	delete(delta_t_array)
261	end if
262
263	k_x=f_att->k_x
264	dimx=dimsizes(k_x)
265	k_y=f_att->k_y
266	dimy=dimsizes(k_y)
267
268
269	dim_level=dimsizes(height_level)
270
271	do i=0,dim-1
272	if (vNam(i) .EQ. "zu_sp")then
273	zu=f_att->zu_sp
274	if (height_level(0) .EQ. -1)then
275	dimz=dimsizes(zu)
276	else
277	if (dim_level .GT. dimsizes(zu))then
278	print(" ")
279	print("'height_level' has more elements than available "+\
280	"height levels in input file (= "+dimsizes(zu)+")")
281	print(" ")
282	exit
283	else
284	zuh=new(dim_level,double)
285	do le=0,dim_level-1
286	if (height_level(le) .GE. dimsizes(zu)) then
287	no_levels=dimsizes(zu)-1
288	print(" ")
289	print("Element "+le+" of 'height_level' is greater " +\
290	"than the maximum available index in input file "+\
291	"which is "+no_levels+". Note that the first " +\
292	"element has the index 0.")
293	print(" ")
294	exit
295	end if
296	zuh(le)=zu(height_level(le))
297	end do
298	dimz=dim_level
299	end if
300	end if
301	else
302	if (vNam(i) .EQ. "zw_sp")then
303	zw=f_att->zw_sp
304	if (height_level(0) .EQ. -1)then
305	dimz=dimsizes(zw)
306	else
307	if (dim_level .GT. dimsizes(zw))then
308	print(" ")
309	print("'height_level' has more elements than available "+\
310	"height levels in input file (= "+dimsizes(zw)+")")
311	print(" ")
312	exit
313	else
314	zwh=new(dim_level,double)
315	do le=0,dim_level-1
316	if (height_level(le) .GE. dimsizes(zw)) then
317	no_levels=dimsizes(zw)-1
318	print(" ")
319	print("Element "+le+" of 'height_level' is greater "+\
320	"than the maximum available index in input " +\
321	"file which is "+no_levels+". Note that the " +\
322	"first element has the index 0.")
323	print(" ")
324	exit
325	end if
326	zwh(le)=zw(height_level(le))
327	end do
328	dimz=dim_level
329	end if
330	end if
331	end if
332	end if
333	end do
334
335	;****************************************************
336	; start of time step and different types of mistakes that could be done
337	;****************************************************
338
339	if (start_time_step .EQ. -1.d) then
340	start_time_step=t_all(0)/3600
341	else
342	if (start_time_step .GT. t_all(nt-1)/3600)then
343	print(" ")
344	print("'start_time_step' = "+ start_time_step +"h is greater than "+\
345	"last time step = "+ t_all(nt-1)+"s = "+t_all(nt-1)/3600+"h")
346	print(" ")
347	print("Select another 'start_time_step'")
348	print(" ")
349	exit
350	end if
351	if (start_time_step .LT. t_all(0)/3600)then
352	print(" ")
353	print("'start_time_step' = "+ start_time_step +"h is lower than "+\
354	"first time step = "+ t_all(0)+"s = "+t_all(0)/3600+"h")
355	exit
356	end if
357	end if
358
359	do i=0,nt-1
360	if (start_time_step .GE. (t_all(i)-delta_t/2)/3600 .AND. \
361	start_time_step .LT. (t_all(i)+delta_t/2)/3600)then
362	st=i
363	break
364	else
365	st=0
366	end if
367	end do
368
369	;****************************************************
370	; end of time step and different types of mistakes that could be done
371	;****************************************************
372
373	if (end_time_step .EQ. -1.d) then
374	end_time_step = t_all(nt-1)/3600
375	else
376	if (end_time_step .GT. t_all(nt-1)/3600)then
377	print(" ")
378	print("'end_time_step' = "+ end_time_step +"h is greater than "+\
379	"last time step = " + t_all(nt-1)+"s = "+t_all(nt-1)/3600+"h")
380	print(" ")
381	print("Select another 'end_time_step'")
382	print(" ")
383	exit
384	end if
385	if (end_time_step .LT. start_time_step/3600)then
386	print(" ")
387	print("'end_time_step' = "+ end_time_step +"h is lower than "+\
388	"'start_time_step' = "+start_time_step+"h")
389	print(" ")
390	print("Select another 'start_time_step' or 'end_time_step'")
391	print(" ")
392	exit
393	end if
394	end if
395
396	do i=0,nt-1
397	if (end_time_step .GE. (t_all(i)-delta_t/2)/3600 .AND. \
398	end_time_step .LT. (t_all(i)+delta_t/2)/3600)then
399	et=i
400	break
401	else
402	et=0
403	end if
404	end do
405
406	delete(start_time_step)
407	start_time_step=round(st,3)
408	delete(end_time_step)
409	end_time_step=round(et,3)
410
411	print(" ")
412	print("Output of time steps from "+t_all(start_time_step)/3600+" h = "+\
413	t_all(start_time_step)+" s => index = "+start_time_step)
414	print(" till "+t_all(end_time_step)/3600+" h = "+\
415	t_all(end_time_step)+" s => index = "+end_time_step)
416	print(" ")
417
418	dimt = end_time_step-start_time_step+1
419
420	;***************************************************
421	; set up recourses
422	;***************************************************
423
424	res = True
425	res@gsnDraw = False
426	res@gsnFrame = False
427	res@txFont = "helvetica"
428	res@tiMainFont = "helvetica"
429	res@tiXAxisFont = "helvetica"
430	res@tiYAxisFont = "helvetica"
431	res@tmXBLabelFont = "helvetica"
432	res@tmYLLabelFont = "helvetica"
433	res@lgLabelFont = "helvetica"
434	res@tmLabelAutoStride = True
435
436	res@lgLabelFontHeightF = font_size_legend
437	res@lgTitleFontHeightF = font_size
438	res@txFontHeightF = font_size
439	res@tiXAxisFontHeightF = font_size
440	res@tiYAxisFontHeightF = font_size
441	res@tmXBLabelFontHeightF = font_size
442	res@tmYLLabelFontHeightF = font_size
443
444	res@tmXBMinorPerMajor = 4
445	res@tmYLMinorPerMajor = 4
446
447	if (log_x .EQ. 1) then
448	res@trXLog = True
449	else
450	res@trXLog = False
451	end if
452	if (log_y .EQ. 1)then
453	res@trYLog = True
454	else
455	res@trYLog = False
456	end if
457
458	legend_label=new(dimt,string)
459	legend_label_zu=new(dimz,double)
460	legend_label_zw=new(dimz,double)
461	legend_label_z=new(dimz,double)
462	do p=start_time_step,end_time_step
463	legend_label(p-start_time_step)=sprintf("%6.2f", t_all(p)/3600)
464	end do
465	if (sort .EQ. "time")
466	plot = new(dim*dimz,graphic)
467	np=dimt
468	res@lgTitleString = "Time (h)"
469	else
470	plot = new(dim*dimt,graphic)
471	np=dimz
472
473	do p=0,dimz-1
474	if (height_level(0) .EQ. -1)then
475	legend_label_zu(p)=round(zu(p),3)
476	legend_label_zw(p)=round(zw(p),3)
477	else
478	legend_label_zu(p)=round(zuh(p),3)
479	legend_label_zw(p)=round(zwh(p),3)
480	end if
481	end do
482	end if
483
484	if (black .eq. 0 ) then
485	if (np .EQ. 1)then
486	color = 237
487	else
488	step=round(235/(np-1),3)
489	color = ispan(2,237,step)
490	end if
491	else
492	color = 2
493	end if
494	if ( dash .eq. 0 ) then
495	res@xyMonoDashPattern = True
496	end if
497
498	if ( format_out .EQ. "pdf" .OR. format_out .EQ. "ps" ) then
499	format_out@wkPaperSize = "A4"
500	end if
501	if ( format_out .EQ. "png" ) then
502	format_out@wkWidth = 1000
503	format_out@wkHeight = 1000
504	end if
505
506	wks=gsn_open_wks(format_out,file_out)
507	gsn_define_colormap(wks,"rainbow+white")
508
509	n=0
510	do varn =dim-1,0,1
511
512	check = True
513
514	if ( isStrSubset( vNam(varn), "time") .OR. \
515	isStrSubset( vNam(varn), "zu_sp") .OR. \
516	isStrSubset( vNam(varn), "zw_sp") .OR. \
517	isStrSubset( vNam(varn), "k_x") .OR. \
518	isStrSubset( vNam(varn), "k_y")) then
519	check = False
520	end if
521
522	if (var .NE. "all") then
523	check = isStrSubset( var,","+vNam(varn)+"," )
524	end if
525
526	if(check) then
527
528	temp = f[:]->$vNam(varn)$
529	data = temp(start_time_step:end_time_step,0:dimz-1,:)
530
531	temp_att = f_att->$vNam(varn)$
532	a=getvardims(temp_att)
533	b=dimsizes(a)
534	delete(temp_att)
535
536	if (height_level(0) .NE. -1)then
537	do te=0,dimz-1
538	data(:,te,:) = temp(start_time_step:end_time_step,\
539	height_level(te),:)
540	end do
541	end if
542
543	data=data/(norm_y*norm_x)
544
545	do i=0,b-1
546	if (isStrSubset( a(i),"zu_sp" ))then
547	legend_label_z=legend_label_zu
548	if (height_level(0) .NE. -1)then
549	z=zuh
550	else
551	z=zu
552	end if
553	else
554	if (isStrSubset( a(i),"zw_sp" ))then
555	legend_label_z=legend_label_zw
556	if (height_level(0) .NE. -1)then
557	z=zwh
558	else
559	z=zw
560	end if
561	end if
562	end if
563	end do
564
565	if (check_vType) then
566	min_y=new(dimz,double)
567	max_y=new(dimz,double)
568	else
569	min_y=new(dimz,float)
570	max_y=new(dimz,float)
571	end if
572	min_x=new(dimz,double)
573	max_x=new(dimz,double)
574
575	plot_h = new(dimz,graphic)
576
577	if (isStrSubset(vNam(varn),"x"))then
578	x_axis = new((/dimz,dimx/),double)
579	do q=0,dimz-1
580	x_axis(q,:) = f_att->k_x
581	x_axis = x_axis/norm_x
582	end do
583	if (norm_x .NE. 1.)then
584	res@tiXAxisString = "k~B~x~N~ ("+unit_x+")"
585	else
586	if (norm_height .EQ. 1)then
587	res@tiXAxisString = "k~B~x~N~ x z (1)"
588	else
589	res@tiXAxisString = "k~B~x~N~ (1/m)"
590	end if
591	end if
592	dim_r=dimx
593	else
594	x_axis=new((/dimz,dimy/),double)
595	do q=0,dimz-1
596	x_axis(q,:) = f_att->k_y
597	x_axis = x_axis/norm_x
598	end do
599	if (norm_x .NE. 1.)then
600	res@tiXAxisString = "k~B~y~N~ ("+unit_x+")"
601	else
602	if (norm_height .EQ. 1)then
603	res@tiXAxisString = "k~B~y~N~ x z (1)"
604	else
605	res@tiXAxisString = "k~B~y~N~ (1/m)"
606	end if
607	end if
608	dim_r=dimy
609	end if
610
611	if (sort .EQ. "time")
612	res@xyLineColors = color
613	res@pmLegendDisplayMode = "Always"
614	res@pmLegendSide = "Top"
615	res@pmLegendParallelPosF = 1.2
616	res@pmLegendOrthogonalPosF = -1.0
617	res@pmLegendWidthF = 0.12
618	res@pmLegendHeightF = 0.04*\
619	(end_time_step-start_time_step+1)
620	do p=dimz-1,0,1
621	if (log_y .EQ. 1)then
622	do q=0,dimt-1
623	do r=0,dim_r-1
624	if (data(q,p,r) .EQ. 0)then
625	st=p+start_time_step
626	print(" ")
627	print("'"+vNam(varn)+"("+st+","+q+","+r+")' is "+\
628	"equal 0. Logarithmic scale for y-axis "+\
629	"and height "+z(p)+" cannot be used")
630	print(" ")
631	res@trYLog = False
632	end if
633	end do
634	end do
635	end if
636	res@gsnLeftString = vNam(varn)
637	res@gsnRightString = "Height = "+z(p)+"m"
638	res@tiYAxisString = "("+unit_y+")"
639	res@xyExplicitLegendLabels = legend_label
640	if (norm_height .EQ. 1)then
641	data(:,p,:)=data(:,p,:)*doubletofloat(z(p))
642	x_axis(p,:) = x_axis(p,:)*z(p)
643	end if
644	res@trXMinF = min(x_axis(p,:))
645	res@trXMaxF = max(x_axis(p,:))
646	plot(n) = gsn_csm_xy(wks,x_axis(p,:),data(:,p,:),res)
647	n=n+1
648	end do
649	else
650	if (sort .EQ. "height")
651	do p=0,dimt-1
652	do q=0,dimz-1
653	do r=0,dim_r-1
654	if (data(p,q,r) .EQ. 0)then
655	st=p+start_time_step
656	print(" ")
657	print("'"+vNam(varn)+"("+st+","+q+","+r+")' "+\
658	"is equal 0. Logarithmic scale for y-axis "+\
659	"and time "+legend_label(p)+" h cannot be used")
660	print(" ")
661	res@trYLog = False
662	end if
663	end do
664	if (norm_height .EQ. 1 .AND. p .EQ. 0)then
665	data(p,q,:) = data(p,q,:)*\
666	doubletofloat(legend_label_z(q))
667	x_axis(q,:) = x_axis(q,:)*\
668	doubletofloat(legend_label_z(q))
669	end if
670	max_y(q)=max(data(p,q,:))
671	min_y(q)=min(data(p,q,:))
672	min_x(q)=min(x_axis(q,:))
673	max_x(q)=max(x_axis(q,:))
674	end do
675	do q=0,dimz-1
676	res@xyLineColor = color(q)
677	if (dash .EQ. 1)then
678	res@xyDashPattern = q
679	end if
680	if (q .EQ. 0)then
681	res@tiYAxisString = "("+unit_y+")"
682	res@gsnLeftString = vNam(varn)
683	res@gsnRightString = "Time = "+legend_label(p)+"h"
684	res@trXMinF = min(min_x)
685	res@trXMaxF = max(max_x)
686	res@trYMinF = min(min_y)
687	res@trYMaxF = max(max_y)
688
689	plot_h(q) = gsn_csm_xy(wks,x_axis(q,:),\
690	data(p,q,:),res)
691
692	lgres = True
693	if (dash .EQ. 0)then
694	lgres@lgMonoDashIndex = True
695	else
696	lgres@lgDashIndexes = ispan(0,dimz-1,1)
697	end if
698	if (black .EQ. 1)then
699	lgres@lgMonoLineColors = True
700	else
701	lgres@lgLineColors = color
702	end if
703	lgres@lgTitleString = "Height (m)"
704	lgres@lgLabelFont = "helvetica"
705	lgres@lgLabelFontHeightF = font_size_legend*6
706	lgres@lgTitleFontHeightF = font_size
707	lgres@vpWidthF = 0.12
708	lgres@vpHeightF = font_size_legend*(dimz+3)
709
710	lbid = gsn_create_legend(wks,dimz,legend_label_z,lgres)
711
712	amres = True
713	amres@amParallelPosF = 0.75
714	amres@amOrthogonalPosF = 0.15
715	annoid1 = gsn_add_annotation(plot_h(q),lbid,amres)
716	else
717	plot_h(q) = gsn_csm_xy(wks,x_axis(q,:),\
718	data(p,q,:),res)
719	overlay(plot_h(0),plot_h(q))
720	end if
721	end do
722	plot(n)=plot_h(0)
723	n=n+1
724	end do
725	end if
726	end if
727	delete(data)
728	delete(temp)
729	delete(x_axis)
730	delete(min_x)
731	delete(max_x)
732	delete(min_y)
733	delete(max_y)
734	delete(plot_h)
735	end if
736	end do
737
738	if (n .EQ. 0) then
739	print(" ")
740	print("The variables 'var="+var+"' do not exist on your input file;")
741	print("be sure to have one comma berfore and after each variable")
742	print(" ")
743	exit
744	end if
745
746	; ***************************************************
747	; merge plots onto one page
748	; ***************************************************
749
750	resP = True
751	resP@gsnMaximize = True
752	resP@gsnPanelXWhiteSpacePercent = 4.0
753	resP@gsnPanelYWhiteSpacePercent = 4.0
754	resP@txFont = "helvetica"
755	resP@txString = f_att@title
756	resP@txFuncCode = "~"
757	resP@txFontHeightF = 0.0105
758
759	no_frames = 0
760
761	if ((format_out .EQ. "eps" .OR. format_out .EQ. "epsi") .AND. \
762	n .gt. no_rows*no_columns) then
763	gsn_panel(wks,plot,(/n,1/),resP)
764	print(" ")
765	print("Outputs to .eps or .epsi have only one frame")
766	print(" ")
767	else
768	do i = 0,n-1, no_rows*no_columns
769	if( (i+no_rows*no_columns) .gt. (n-1)) then
770	gsn_panel(wks,plot(i:n-1),(/no_rows,no_columns/),resP)
771	no_frames = no_frames + 1
772	else
773	gsn_panel(wks,plot(i:i+no_rows*no_columns-1),\
774	(/no_rows,no_columns/),resP)
775	no_frames = no_frames + 1
776	end if
777	end do
778	end if
779
780	if (format_out .EQ. "png" ) then
781	png_output = new((/no_frames/), string)
782	j = 0
783
784	if (no_frames .eq. 1) then
785	if (ncl_version .GE. 6 ) then
786	png_output(0) = file_out+".png"
787	else
788	png_output(0) = file_out+".00000"+1+".png"
789	end if
790	;using imagemagick's convert for reducing the white
791	;space around the plot
792	cmd = "convert -geometry 1000x1000 -density 300 -trim " + \
793	png_output(0) + " " + png_output(0)
794	system(cmd)
795	else
796
797	do i=0, no_frames-1
798	j = i + 1
799	if (j .LE. 9) then
800	png_output(i) = file_out+".00000"+j+".png"
801	end if
802	if (j .GT. 9 .AND. j .LE. 99) then
803	png_output(i) = file_out+".0000"+j+".png"
804	end if
805	if (j .GT. 99 .AND. j .LE. 999) then
806	png_output(i) = file_out+".000"+j+".png"
807	end if
808	if (j .GT. 999) then
809	png_output(i) = file_out+".00"+j+".png"
810	end if
811
812	;using imagemagick's convert for reducing the white
813	;space around the plot
814	cmd = "convert -geometry 1000x1000 -density 300 -trim " + \
815	png_output(i) + " " + png_output(i)
816	system(cmd)
817	end do
818	end if
819
820	print(" ")
821	print("Output to: "+ png_output)
822	print(" ")
823	else
824	print(" ")
825	print("Output to: " + file_out +"."+ format_out)
826	print(" ")
827	end if
828
829	end

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