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spectra.ncl @ 1517

Last change on this file since 1517 was 1248, checked in by heinze, 11 years ago
NCL function getfilevarnames changed with NCL version 6.1.1 and higher -> adaptation required
File size: 24.0 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 "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
4
5	;***************************************************
6	; load .ncl.config or .ncl.config.default
7	;***************************************************
8
9	function which_script()
10	local script
11	begin
12	script="spectra"
13	return(script)
14	end
15
16	if (isfilepresent("$PALM_BIN/../../.ncl.config")) then
17	loadscript("$PALM_BIN/../../.ncl.config")
18	else
19	if (isfilepresent("$PALM_BIN/NCL/.ncl.config.default")) then
20	loadscript( "$PALM_BIN/NCL/.ncl.config.default")
21	else
22	palm_bin_path = getenv("PALM_BIN")
23	print(" ")
24	print("Neither the personal configuration file '.ncl.config' exists in")
25	print("~/palm/current_version")
26	print("nor the default configuration file '.ncl.config.default' "+\
27	"exists in")
28	print(palm_bin_path + "/NCL")
29	print(" ")
30	exit
31	end if
32	end if
33
34	begin
35
36	;***************************************************
37	; Retrieving the NCL version used
38	;***************************************************
39
40	ncl_version_ch = systemfunc("ncl -V")
41	ncl_version = stringtofloat(ncl_version_ch)
42
43	;***************************************************
44	; Retrieving the double quote character
45	;***************************************************
46
47	dq=str_get_dq()
48
49	;***************************************************
50	; set up default parameter values and strings
51	;***************************************************
52
53	if (file_1 .EQ. "File in") then
54	print(" ")
55	print("Declare input file 'file_1=' in '.ncl.config' or prompt")
56	print(" ")
57	exit
58	else
59	file_in = file_1
60	end if
61
62	if (format_out .NE. "x11" .AND. format_out .NE. "pdf" .AND. \
63	format_out .NE. "eps" .AND. format_out .NE. "ps" .AND. \
64	format_out .NE. "epsi" .AND. format_out .NE. "ncgm" .AND. \
65	format_out .NE. "png")then
66	print(" ")
67	print("'format_out = "+format_out+"' is invalid and set to'x11'")
68	print(" ")
69	format_out="x11"
70	end if
71
72	if (ncl_version .LE. 5.1 .AND. format_out .EQ. "png") then
73	print(" ")
74	print("Output of png files not available")
75	print("png output is avaiable with NCL version 5.2.0 and higher ")
76	print("NCL version used: " + ncl_version_ch)
77	print(" ")
78	exit
79	end if
80
81	if (log_x .NE. 0 .AND. log_x .NE. 1)then
82	print(" ")
83	print("'log_x'= "+log_x+" is invalid and set to 1")
84	print(" ")
85	log_x = 1
86	end if
87
88	if (log_y .NE. 0 .AND. log_y .NE. 1)then
89	print(" ")
90	print("'log_y'= "+log_y+" is invalid and set to 1")
91	print(" ")
92	log_y = 1
93	end if
94
95	if (norm_y .EQ. 0.) then
96	print(" ")
97	print("Normalising with 0 is not allowed, 'norm_y' is set to 1.0")
98	print(" ")
99	norm_y = 1.0
100	end if
101	if (norm_x .EQ. 0.) then
102	print(" ")
103	print("Normalising with 0 is not allowed, 'norm_x' is set to 1.0")
104	print(" ")
105	norm_x= 1.0
106	end if
107
108	if (sort .NE. "height" .AND. sort .NE. "time") then
109	print(" ")
110	print("'sort'= "+sort+" is invalid and set to 'height'")
111	print(" ")
112	sort = "height"
113	end if
114
115	if (black .NE. 0 .AND. black .NE. 1)then
116	print(" ")
117	print("'black'= "+black+" is invalid and set to 0")
118	print(" ")
119	black = 0
120	end if
121
122	if (dash .NE. 0 .AND. dash .NE. 1)then
123	print(" ")
124	print("'dash'= "+dash+" is invalid and set to 0")
125	print(" ")
126	dash = 0
127	end if
128
129	;***************************************************
130	; open input file
131	;***************************************************
132
133	file_in_1 = False
134	if (isStrSubset(file_in, ".nc"))then
135	start_f = -2
136	end_f = -2
137	file_in_1 = True
138	end if
139
140	if (start_f .EQ. -1)then
141	print(" ")
142	print("'start_f' must be one of the cyclic numbers (at least 0) of "+\
143	"your input file(s)")
144	print(" ")
145	exit
146	end if
147	if (end_f .EQ. -1)then
148	print(" ")
149	print("'end_f' must be one of the cyclic numbers (at least 0) of "+\
150	"your input file(s)")
151	print(" ")
152	exit
153	end if
154
155	files=new(end_f-start_f+1,string)
156
157	if (file_in_1)then
158	if (isfilepresent(file_in))then
159	files(0)=file_in
160	else
161	print(" ")
162	print("1st input file: '"+file_in+"' does not exist")
163	print(" ")
164	exit
165	end if
166	else
167	if (start_f .EQ. 0)then
168	if (isfilepresent(file_in+".nc"))then
169	files(0)=file_in+".nc"
170	do i=1,end_f
171	if (isfilepresent(file_in+"."+i+".nc"))then
172	files(i)=file_in+"."+i+".nc"
173	else
174	print(" ")
175	print("Input file: '"+file_in+"."+i+".nc' does not exist")
176	print(" ")
177	exit
178	end if
179	end do
180	else
181	print(" ")
182	print("Input file: '"+file_in+".nc' does not exist")
183	print(" ")
184	exit
185	end if
186	else
187	do i=start_f,end_f
188	if (isfilepresent(file_in+"."+i+".nc"))then
189	files(i-start_f)=file_in+"."+i+".nc"
190	else
191	print(" ")
192	print("Input file: '"+file_in+"."+i+".nc' does not exist")
193	print(" ")
194	exit
195	end if
196	end do
197	end if
198	end if
199
200	f=addfiles(files,"r")
201	f_att=addfile(files(0),"r")
202	ListSetType(f,"cat")
203
204	vNam = getfilevarnames(f_att)
205	if( ncl_version .GE. 6.1 ) then
206	vNam = vNam(::-1)
207	end if
208	vType = getfilevartypes(f_att,vNam)
209
210	if ((all(vType .eq. "double"))) then ;distinction if data is double or float
211	check_vType = True
212	else
213	check_vType = False
214	end if
215
216	print(" ")
217	print("Variables in input file:")
218	print("- "+ vNam)
219	print(" ")
220	dim = dimsizes(vNam)
221	vDim = getfiledimsizes(f_att)
222
223	t_all = f[:]->time
224	nt = dimsizes(t_all)
225
226	if (nt .EQ. 1)then
227	delta_t=t_all(nt-1)/nt
228	else
229	delta_t_array = new(nt-1,double)
230
231	do i=0,nt-2
232	delta_t_array(i) = t_all(i+1)-t_all(i)
233	end do
234
235	delta_t = min(delta_t_array)
236	delete(delta_t_array)
237	end if
238
239	k_x=f_att->k_x
240	dimx=dimsizes(k_x)
241	k_y=f_att->k_y
242	dimy=dimsizes(k_y)
243
244
245	dim_level=dimsizes(height_level)
246
247	do i=0,dim-1
248	if (vNam(i) .EQ. "zu_sp")then
249	zu=f_att->zu_sp
250	if (height_level(0) .EQ. -1)then
251	dimz=dimsizes(zu)
252	else
253	if (dim_level .GT. dimsizes(zu))then
254	print(" ")
255	print("'height_level' has more elements than available "+\
256	"height levels in input file (= "+dimsizes(zu)+")")
257	print(" ")
258	exit
259	else
260	zuh=new(dim_level,double)
261	do le=0,dim_level-1
262	if (height_level(le) .GE. dimsizes(zu)) then
263	no_levels=dimsizes(zu)-1
264	print(" ")
265	print("Element "+le+" of 'height_level' is greater " +\
266	"than the maximum available index in input file "+\
267	"which is "+no_levels+". Note that the first " +\
268	"element has the index 0.")
269	print(" ")
270	exit
271	end if
272	zuh(le)=zu(height_level(le))
273	end do
274	dimz=dim_level
275	end if
276	end if
277	else
278	if (vNam(i) .EQ. "zw_sp")then
279	zw=f_att->zw_sp
280	if (height_level(0) .EQ. -1)then
281	dimz=dimsizes(zw)
282	else
283	if (dim_level .GT. dimsizes(zw))then
284	print(" ")
285	print("'height_level' has more elements than available "+\
286	"height levels in input file (= "+dimsizes(zw)+")")
287	print(" ")
288	exit
289	else
290	zwh=new(dim_level,double)
291	do le=0,dim_level-1
292	if (height_level(le) .GE. dimsizes(zw)) then
293	no_levels=dimsizes(zw)-1
294	print(" ")
295	print("Element "+le+" of 'height_level' is greater "+\
296	"than the maximum available index in input " +\
297	"file which is "+no_levels+". Note that the " +\
298	"first element has the index 0.")
299	print(" ")
300	exit
301	end if
302	zwh(le)=zw(height_level(le))
303	end do
304	dimz=dim_level
305	end if
306	end if
307	end if
308	end if
309	end do
310
311	;****************************************************
312	; start of time step and different types of mistakes that could be done
313	;****************************************************
314
315	if (start_time_step .EQ. -1.d) then
316	start_time_step=t_all(0)/3600
317	else
318	if (start_time_step .GT. t_all(nt-1)/3600)then
319	print(" ")
320	print("'start_time_step' = "+ start_time_step +"h is greater than "+\
321	"last time step = "+ t_all(nt-1)+"s = "+t_all(nt-1)/3600+"h")
322	print(" ")
323	print("Select another 'start_time_step'")
324	print(" ")
325	exit
326	end if
327	if (start_time_step .LT. t_all(0)/3600)then
328	print(" ")
329	print("'start_time_step' = "+ start_time_step +"h is lower than "+\
330	"first time step = "+ t_all(0)+"s = "+t_all(0)/3600+"h")
331	exit
332	end if
333	end if
334
335	do i=0,nt-1
336	if (start_time_step .GE. (t_all(i)-delta_t/2)/3600 .AND. \
337	start_time_step .LT. (t_all(i)+delta_t/2)/3600)then
338	st=i
339	break
340	else
341	st=0
342	end if
343	end do
344
345	;****************************************************
346	; end of time step and different types of mistakes that could be done
347	;****************************************************
348
349	if (end_time_step .EQ. -1.d) then
350	end_time_step = t_all(nt-1)/3600
351	else
352	if (end_time_step .GT. t_all(nt-1)/3600)then
353	print(" ")
354	print("'end_time_step' = "+ end_time_step +"h is greater than "+\
355	"last time step = " + t_all(nt-1)+"s = "+t_all(nt-1)/3600+"h")
356	print(" ")
357	print("Select another 'end_time_step'")
358	print(" ")
359	exit
360	end if
361	if (end_time_step .LT. start_time_step/3600)then
362	print(" ")
363	print("'end_time_step' = "+ end_time_step +"h is lower than "+\
364	"'start_time_step' = "+start_time_step+"h")
365	print(" ")
366	print("Select another 'start_time_step' or 'end_time_step'")
367	print(" ")
368	exit
369	end if
370	end if
371
372	do i=0,nt-1
373	if (end_time_step .GE. (t_all(i)-delta_t/2)/3600 .AND. \
374	end_time_step .LT. (t_all(i)+delta_t/2)/3600)then
375	et=i
376	break
377	else
378	et=0
379	end if
380	end do
381
382	delete(start_time_step)
383	start_time_step=round(st,3)
384	delete(end_time_step)
385	end_time_step=round(et,3)
386
387	print(" ")
388	print("Output of time steps from "+t_all(start_time_step)/3600+" h = "+\
389	t_all(start_time_step)+" s => index = "+start_time_step)
390	print(" till "+t_all(end_time_step)/3600+" h = "+\
391	t_all(end_time_step)+" s => index = "+end_time_step)
392	print(" ")
393
394	dimt = end_time_step-start_time_step+1
395
396	;***************************************************
397	; set up recourses
398	;***************************************************
399
400	res = True
401	res@gsnDraw = False
402	res@gsnFrame = False
403	res@txFont = "helvetica"
404	res@tiMainFont = "helvetica"
405	res@tiXAxisFont = "helvetica"
406	res@tiYAxisFont = "helvetica"
407	res@tmXBLabelFont = "helvetica"
408	res@tmYLLabelFont = "helvetica"
409	res@lgLabelFont = "helvetica"
410	res@tmLabelAutoStride = True
411
412	res@lgLabelFontHeightF = font_size_legend
413	res@lgTitleFontHeightF = font_size
414	res@txFontHeightF = font_size
415	res@tiXAxisFontHeightF = font_size
416	res@tiYAxisFontHeightF = font_size
417	res@tmXBLabelFontHeightF = font_size
418	res@tmYLLabelFontHeightF = font_size
419
420	res@tmXBMinorPerMajor = 4
421	res@tmYLMinorPerMajor = 4
422
423	if (log_x .EQ. 1) then
424	res@trXLog = True
425	else
426	res@trXLog = False
427	end if
428	if (log_y .EQ. 1)then
429	res@trYLog = True
430	else
431	res@trYLog = False
432	end if
433
434	legend_label=new(dimt,string)
435	legend_label_zu=new(dimz,double)
436	legend_label_zw=new(dimz,double)
437	legend_label_z=new(dimz,double)
438	do p=start_time_step,end_time_step
439	legend_label(p-start_time_step)=sprintf("%6.2f", t_all(p)/3600)
440	end do
441	if (sort .EQ. "time")
442	plot = new(dim*dimz,graphic)
443	np=dimt
444	res@lgTitleString = "Time (h)"
445	else
446	plot = new(dim*dimt,graphic)
447	np=dimz
448
449	do p=0,dimz-1
450	if (height_level(0) .EQ. -1)then
451	legend_label_zu(p)=round(zu(p),3)
452	legend_label_zw(p)=round(zw(p),3)
453	else
454	legend_label_zu(p)=round(zuh(p),3)
455	legend_label_zw(p)=round(zwh(p),3)
456	end if
457	end do
458	end if
459
460	if (black .eq. 0 ) then
461	if (np .EQ. 1)then
462	color = 237
463	else
464	step=round(235/(np-1),3)
465	color = ispan(2,237,step)
466	end if
467	else
468	color = 2
469	end if
470	if ( dash .eq. 0 ) then
471	res@xyMonoDashPattern = True
472	end if
473
474	if ( format_out .EQ. "pdf" .OR. format_out .EQ. "ps" ) then
475	format_out@wkPaperSize = "A4"
476	end if
477	if ( format_out .EQ. "png" ) then
478	format_out@wkWidth = 1000
479	format_out@wkHeight = 1000
480	end if
481
482	wks=gsn_open_wks(format_out,file_out)
483	gsn_define_colormap(wks,"rainbow+white")
484
485	n=0
486	do varn =dim-1,0,1
487
488	check = True
489
490	if ( isStrSubset( vNam(varn), "time") .OR. \
491	isStrSubset( vNam(varn), "zu_sp") .OR. \
492	isStrSubset( vNam(varn), "zw_sp") .OR. \
493	isStrSubset( vNam(varn), "k_x") .OR. \
494	isStrSubset( vNam(varn), "k_y")) then
495	check = False
496	end if
497
498	if (var .NE. "all") then
499	check = isStrSubset( var,","+vNam(varn)+"," )
500	end if
501
502	if(check) then
503
504	temp = f[:]->$vNam(varn)$
505	data = temp(start_time_step:end_time_step,0:dimz-1,:)
506
507	temp_att = f_att->$vNam(varn)$
508	a=getvardims(temp_att)
509	b=dimsizes(a)
510	delete(temp_att)
511
512	if (height_level(0) .NE. -1)then
513	do te=0,dimz-1
514	data(:,te,:) = temp(start_time_step:end_time_step,\
515	height_level(te),:)
516	end do
517	end if
518
519	data=data/(norm_y*norm_x)
520
521	do i=0,b-1
522	if (isStrSubset( a(i),"zu_sp" ))then
523	legend_label_z=legend_label_zu
524	if (height_level(0) .NE. -1)then
525	z=zuh
526	else
527	z=zu
528	end if
529	else
530	if (isStrSubset( a(i),"zw_sp" ))then
531	legend_label_z=legend_label_zw
532	if (height_level(0) .NE. -1)then
533	z=zwh
534	else
535	z=zw
536	end if
537	end if
538	end if
539	end do
540
541	if (check_vType) then
542	min_y=new(dimz,double)
543	max_y=new(dimz,double)
544	else
545	min_y=new(dimz,float)
546	max_y=new(dimz,float)
547	end if
548	min_x=new(dimz,double)
549	max_x=new(dimz,double)
550
551	plot_h = new(dimz,graphic)
552
553	if (isStrSubset(vNam(varn),"x"))then
554	x_axis = new((/dimz,dimx/),double)
555	do q=0,dimz-1
556	x_axis(q,:) = f_att->k_x
557	x_axis = x_axis/norm_x
558	end do
559	if (norm_x .NE. 1.)then
560	res@tiXAxisString = "k~B~x~N~ ("+unit_x+")"
561	else
562	if (norm_height .EQ. 1)then
563	res@tiXAxisString = "k~B~x~N~ x z (1"
564	else
565	res@tiXAxisString = "k~B~x~N~ (1/m)"
566	end if
567	end if
568	dim_r=dimx
569	else
570	x_axis=new((/dimz,dimy/),double)
571	do q=0,dimz-1
572	x_axis(q,:) = f_att->k_y
573	x_axis = x_axis/norm_x
574	end do
575	if (norm_x .NE. 1.)then
576	res@tiXAxisString = "k~B~x~N~ ("+unit_x+")"
577	else
578	if (norm_height .EQ. 1)then
579	res@tiXAxisString = "k~B~x~N~ x z (1)"
580	else
581	res@tiXAxisString = "k~B~x~N~ (1/m)"
582	end if
583	end if
584	dim_r=dimy
585	end if
586
587	if (sort .EQ. "time")
588	res@xyLineColors = color
589	res@pmLegendDisplayMode = "Always"
590	res@pmLegendSide = "Top"
591	res@pmLegendParallelPosF = 1.2
592	res@pmLegendOrthogonalPosF = -1.0
593	res@pmLegendWidthF = 0.12
594	res@pmLegendHeightF = 0.04*\
595	(end_time_step-start_time_step+1)
596	do p=dimz-1,0,1
597	if (log_y .EQ. 1)then
598	do q=0,dimt-1
599	do r=0,dim_r-1
600	if (data(q,p,r) .EQ. 0)then
601	st=p+start_time_step
602	print(" ")
603	print("'"+vNam(varn)+"("+st+","+q+","+r+")' is "+\
604	"equal 0. Logarithmic scale for y-axis "+\
605	"and height "+z(p)+" cannot be used")
606	print(" ")
607	res@trYLog = False
608	end if
609	end do
610	end do
611	end if
612	res@gsnLeftString = vNam(varn)
613	res@gsnRightString = "Height = "+z(p)+"m"
614	res@tiYAxisString = "("+unit_y+")"
615	res@xyExplicitLegendLabels = legend_label
616	if (norm_height .EQ. 1)then
617	data(:,p,:)=data(:,p,:)*doubletofloat(z(p))
618	x_axis(p,:) = x_axis(p,:)*z(p)
619	end if
620	res@trXMinF = min(x_axis(p,:))
621	res@trXMaxF = max(x_axis(p,:))
622	plot(n) = gsn_csm_xy(wks,x_axis(p,:),data(:,p,:),res)
623	n=n+1
624	end do
625	else
626	if (sort .EQ. "height")
627	do p=0,dimt-1
628	do q=0,dimz-1
629	do r=0,dim_r-1
630	if (data(p,q,r) .EQ. 0)then
631	st=p+start_time_step
632	print(" ")
633	print("'"+vNam(varn)+"("+st+","+q+","+r+")' "+\
634	"is equal 0. Logarithmic scale for y-axis "+\
635	"and time "+legend_label(p)+" h cannot be used")
636	print(" ")
637	res@trYLog = False
638	end if
639	end do
640	if (norm_height .EQ. 1 .AND. p .EQ. 0)then
641	data(p,q,:) = data(p,q,:)*\
642	doubletofloat(legend_label_z(q))
643	x_axis(q,:) = x_axis(q,:)*\
644	doubletofloat(legend_label_z(q))
645	end if
646	max_y(q)=max(data(p,q,:))
647	min_y(q)=min(data(p,q,:))
648	min_x(q)=min(x_axis(q,:))
649	max_x(q)=max(x_axis(q,:))
650	end do
651	do q=0,dimz-1
652	res@xyLineColor = color(q)
653	if (dash .EQ. 1)then
654	res@xyDashPattern = q
655	end if
656	if (q .EQ. 0)then
657	res@tiYAxisString = "("+unit_y+")"
658	res@gsnLeftString = vNam(varn)
659	res@gsnRightString = "Time = "+legend_label(p)+"h"
660	res@trXMinF = min(min_x)
661	res@trXMaxF = max(max_x)
662	res@trYMinF = min(min_y)
663	res@trYMaxF = max(max_y)
664
665	plot_h(q) = gsn_csm_xy(wks,x_axis(q,:),\
666	data(p,q,:),res)
667
668	lgres = True
669	if (dash .EQ. 0)then
670	lgres@lgMonoDashIndex = True
671	else
672	lgres@lgDashIndexes = ispan(0,dimz-1,1)
673	end if
674	if (black .EQ. 1)then
675	lgres@lgMonoLineColors = True
676	else
677	lgres@lgLineColors = color
678	end if
679	lgres@lgTitleString = "Height (m)"
680	lgres@lgLabelFont = "helvetica"
681	lgres@lgLabelFontHeightF = font_size_legend*6
682	lgres@lgTitleFontHeightF = font_size
683	lgres@vpWidthF = 0.12
684	lgres@vpHeightF = font_size_legend*(dimz+3)
685
686	lbid = gsn_create_legend(wks,dimz,legend_label_z,lgres)
687
688	amres = True
689	amres@amParallelPosF = 0.75
690	amres@amOrthogonalPosF = 0.15
691	annoid1 = gsn_add_annotation(plot_h(q),lbid,amres)
692	else
693	plot_h(q) = gsn_csm_xy(wks,x_axis(q,:),\
694	data(p,q,:),res)
695	overlay(plot_h(0),plot_h(q))
696	end if
697	end do
698	plot(n)=plot_h(0)
699	n=n+1
700	end do
701	end if
702	end if
703	delete(data)
704	delete(temp)
705	delete(x_axis)
706	delete(min_x)
707	delete(max_x)
708	delete(min_y)
709	delete(max_y)
710	delete(plot_h)
711	end if
712	end do
713
714	if (n .EQ. 0) then
715	print(" ")
716	print("The variables 'var="+var+"' do not exist on your input file;")
717	print("be sure to have one comma berfore and after each variable")
718	print(" ")
719	exit
720	end if
721
722	; ***************************************************
723	; merge plots onto one page
724	; ***************************************************
725
726	resP = True
727	resP@gsnMaximize = True
728	resP@gsnPanelXWhiteSpacePercent = 4.0
729	resP@gsnPanelYWhiteSpacePercent = 4.0
730	resP@txFont = "helvetica"
731	resP@txString = f_att@title
732	resP@txFuncCode = "~"
733	resP@txFontHeightF = 0.0105
734
735	no_frames = 0
736
737	if ((format_out .EQ. "eps" .OR. format_out .EQ. "epsi") .AND. \
738	n .gt. no_rows*no_columns) then
739	gsn_panel(wks,plot,(/n,1/),resP)
740	print(" ")
741	print("Outputs to .eps or .epsi have only one frame")
742	print(" ")
743	else
744	do i = 0,n-1, no_rows*no_columns
745	if( (i+no_rows*no_columns) .gt. (n-1)) then
746	gsn_panel(wks,plot(i:n-1),(/no_rows,no_columns/),resP)
747	no_frames = no_frames + 1
748	else
749	gsn_panel(wks,plot(i:i+no_rows*no_columns-1),\
750	(/no_rows,no_columns/),resP)
751	no_frames = no_frames + 1
752	end if
753	end do
754	end if
755
756	if (format_out .EQ. "png" ) then
757	png_output = new((/no_frames/), string)
758	j = 0
759
760	if (no_frames .eq. 1) then
761	if (ncl_version .GE. 6 ) then
762	png_output(0) = file_out+".png"
763	else
764	png_output(0) = file_out+".00000"+1+".png"
765	end if
766	;using imagemagick's convert for reducing the white
767	;space around the plot
768	cmd = "convert -geometry 1000x1000 -density 300 -trim " + \
769	png_output(0) + " " + png_output(0)
770	system(cmd)
771	else
772
773	do i=0, no_frames-1
774	j = i + 1
775	if (j .LE. 9) then
776	png_output(i) = file_out+".00000"+j+".png"
777	end if
778	if (j .GT. 9 .AND. j .LE. 99) then
779	png_output(i) = file_out+".0000"+j+".png"
780	end if
781	if (j .GT. 99 .AND. j .LE. 999) then
782	png_output(i) = file_out+".000"+j+".png"
783	end if
784	if (j .GT. 999) then
785	png_output(i) = file_out+".00"+j+".png"
786	end if
787
788	;using imagemagick's convert for reducing the white
789	;space around the plot
790	cmd = "convert -geometry 1000x1000 -density 300 -trim " + \
791	png_output(i) + " " + png_output(i)
792	system(cmd)
793	end do
794	end if
795
796	print(" ")
797	print("Output to: "+ png_output)
798	print(" ")
799	else
800	print(" ")
801	print("Output to: " + file_out +"."+ format_out)
802	print(" ")
803	end if
804
805	end

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