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spectra.ncl @ 1038

Last change on this file since 1038 was 983, checked in by hoffmann, 12 years ago
Bugfix in netcdf.f90 and improvements in palmplot.
File size: 23.9 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	vType = getfilevartypes(f_att,vNam)
206
207	if ((all(vType .eq. "double"))) then ;distinction if data is double or float
208	check_vType = True
209	else
210	check_vType = False
211	end if
212
213	print(" ")
214	print("Variables in input file:")
215	print("- "+ vNam)
216	print(" ")
217	dim = dimsizes(vNam)
218	vDim = getfiledimsizes(f_att)
219
220	t_all = f[:]->time
221	nt = dimsizes(t_all)
222
223	if (nt .EQ. 1)then
224	delta_t=t_all(nt-1)/nt
225	else
226	delta_t_array = new(nt-1,double)
227
228	do i=0,nt-2
229	delta_t_array(i) = t_all(i+1)-t_all(i)
230	end do
231
232	delta_t = min(delta_t_array)
233	delete(delta_t_array)
234	end if
235
236	k_x=f_att->k_x
237	dimx=dimsizes(k_x)
238	k_y=f_att->k_y
239	dimy=dimsizes(k_y)
240
241
242	dim_level=dimsizes(height_level)
243
244	do i=0,dim-1
245	if (vNam(i) .EQ. "zu_sp")then
246	zu=f_att->zu_sp
247	if (height_level(0) .EQ. -1)then
248	dimz=dimsizes(zu)
249	else
250	if (dim_level .GT. dimsizes(zu))then
251	print(" ")
252	print("'height_level' has more elements than available "+\
253	"height levels in input file (= "+dimsizes(zu)+")")
254	print(" ")
255	exit
256	else
257	zuh=new(dim_level,double)
258	do le=0,dim_level-1
259	if (height_level(le) .GE. dimsizes(zu)) then
260	no_levels=dimsizes(zu)-1
261	print(" ")
262	print("Element "+le+" of 'height_level' is greater " +\
263	"than the maximum available index in input file "+\
264	"which is "+no_levels+". Note that the first " +\
265	"element has the index 0.")
266	print(" ")
267	exit
268	end if
269	zuh(le)=zu(height_level(le))
270	end do
271	dimz=dim_level
272	end if
273	end if
274	else
275	if (vNam(i) .EQ. "zw_sp")then
276	zw=f_att->zw_sp
277	if (height_level(0) .EQ. -1)then
278	dimz=dimsizes(zw)
279	else
280	if (dim_level .GT. dimsizes(zw))then
281	print(" ")
282	print("'height_level' has more elements than available "+\
283	"height levels in input file (= "+dimsizes(zw)+")")
284	print(" ")
285	exit
286	else
287	zwh=new(dim_level,double)
288	do le=0,dim_level-1
289	if (height_level(le) .GE. dimsizes(zw)) then
290	no_levels=dimsizes(zw)-1
291	print(" ")
292	print("Element "+le+" of 'height_level' is greater "+\
293	"than the maximum available index in input " +\
294	"file which is "+no_levels+". Note that the " +\
295	"first element has the index 0.")
296	print(" ")
297	exit
298	end if
299	zwh(le)=zw(height_level(le))
300	end do
301	dimz=dim_level
302	end if
303	end if
304	end if
305	end if
306	end do
307
308	;****************************************************
309	; start of time step and different types of mistakes that could be done
310	;****************************************************
311
312	if (start_time_step .EQ. -1.d) then
313	start_time_step=t_all(0)/3600
314	else
315	if (start_time_step .GT. t_all(nt-1)/3600)then
316	print(" ")
317	print("'start_time_step' = "+ start_time_step +"h is greater than "+\
318	"last time step = "+ t_all(nt-1)+"s = "+t_all(nt-1)/3600+"h")
319	print(" ")
320	print("Select another 'start_time_step'")
321	print(" ")
322	exit
323	end if
324	if (start_time_step .LT. t_all(0)/3600)then
325	print(" ")
326	print("'start_time_step' = "+ start_time_step +"h is lower than "+\
327	"first time step = "+ t_all(0)+"s = "+t_all(0)/3600+"h")
328	exit
329	end if
330	end if
331
332	do i=0,nt-1
333	if (start_time_step .GE. (t_all(i)-delta_t/2)/3600 .AND. \
334	start_time_step .LT. (t_all(i)+delta_t/2)/3600)then
335	st=i
336	break
337	else
338	st=0
339	end if
340	end do
341
342	;****************************************************
343	; end of time step and different types of mistakes that could be done
344	;****************************************************
345
346	if (end_time_step .EQ. -1.d) then
347	end_time_step = t_all(nt-1)/3600
348	else
349	if (end_time_step .GT. t_all(nt-1)/3600)then
350	print(" ")
351	print("'end_time_step' = "+ end_time_step +"h is greater than "+\
352	"last time step = " + t_all(nt-1)+"s = "+t_all(nt-1)/3600+"h")
353	print(" ")
354	print("Select another 'end_time_step'")
355	print(" ")
356	exit
357	end if
358	if (end_time_step .LT. start_time_step/3600)then
359	print(" ")
360	print("'end_time_step' = "+ end_time_step +"h is lower than "+\
361	"'start_time_step' = "+start_time_step+"h")
362	print(" ")
363	print("Select another 'start_time_step' or 'end_time_step'")
364	print(" ")
365	exit
366	end if
367	end if
368
369	do i=0,nt-1
370	if (end_time_step .GE. (t_all(i)-delta_t/2)/3600 .AND. \
371	end_time_step .LT. (t_all(i)+delta_t/2)/3600)then
372	et=i
373	break
374	else
375	et=0
376	end if
377	end do
378
379	delete(start_time_step)
380	start_time_step=round(st,3)
381	delete(end_time_step)
382	end_time_step=round(et,3)
383
384	print(" ")
385	print("Output of time steps from "+t_all(start_time_step)/3600+" h = "+\
386	t_all(start_time_step)+" s => index = "+start_time_step)
387	print(" till "+t_all(end_time_step)/3600+" h = "+\
388	t_all(end_time_step)+" s => index = "+end_time_step)
389	print(" ")
390
391	dimt = end_time_step-start_time_step+1
392
393	;***************************************************
394	; set up recourses
395	;***************************************************
396
397	res = True
398	res@gsnDraw = False
399	res@gsnFrame = False
400	res@txFont = "helvetica"
401	res@tiMainFont = "helvetica"
402	res@tiXAxisFont = "helvetica"
403	res@tiYAxisFont = "helvetica"
404	res@tmXBLabelFont = "helvetica"
405	res@tmYLLabelFont = "helvetica"
406	res@lgLabelFont = "helvetica"
407	res@tmLabelAutoStride = True
408
409	res@lgLabelFontHeightF = font_size_legend
410	res@lgTitleFontHeightF = font_size
411	res@txFontHeightF = font_size
412	res@tiXAxisFontHeightF = font_size
413	res@tiYAxisFontHeightF = font_size
414	res@tmXBLabelFontHeightF = font_size
415	res@tmYLLabelFontHeightF = font_size
416
417	res@tmXBMinorPerMajor = 4
418	res@tmYLMinorPerMajor = 4
419
420	if (log_x .EQ. 1) then
421	res@trXLog = True
422	else
423	res@trXLog = False
424	end if
425	if (log_y .EQ. 1)then
426	res@trYLog = True
427	else
428	res@trYLog = False
429	end if
430
431	legend_label=new(dimt,string)
432	legend_label_zu=new(dimz,double)
433	legend_label_zw=new(dimz,double)
434	legend_label_z=new(dimz,double)
435	do p=start_time_step,end_time_step
436	legend_label(p-start_time_step)=sprintf("%6.2f", t_all(p)/3600)
437	end do
438	if (sort .EQ. "time")
439	plot = new(dim*dimz,graphic)
440	np=dimt
441	res@lgTitleString = "Time (h)"
442	else
443	plot = new(dim*dimt,graphic)
444	np=dimz
445
446	do p=0,dimz-1
447	if (height_level(0) .EQ. -1)then
448	legend_label_zu(p)=round(zu(p),3)
449	legend_label_zw(p)=round(zw(p),3)
450	else
451	legend_label_zu(p)=round(zuh(p),3)
452	legend_label_zw(p)=round(zwh(p),3)
453	end if
454	end do
455	end if
456
457	if (black .eq. 0 ) then
458	if (np .EQ. 1)then
459	color = 237
460	else
461	step=round(235/(np-1),3)
462	color = ispan(2,237,step)
463	end if
464	else
465	color = 2
466	end if
467	if ( dash .eq. 0 ) then
468	res@xyMonoDashPattern = True
469	end if
470
471	if ( format_out .EQ. "pdf" .OR. format_out .EQ. "ps" ) then
472	format_out@wkPaperSize = "A4"
473	end if
474	if ( format_out .EQ. "png" ) then
475	format_out@wkWidth = 1000
476	format_out@wkHeight = 1000
477	end if
478
479	wks=gsn_open_wks(format_out,file_out)
480	gsn_define_colormap(wks,"rainbow+white")
481
482	n=0
483	do varn =dim-1,0,1
484
485	check = True
486
487	if ( isStrSubset( vNam(varn), "time") .OR. \
488	isStrSubset( vNam(varn), "zu_sp") .OR. \
489	isStrSubset( vNam(varn), "zw_sp") .OR. \
490	isStrSubset( vNam(varn), "k_x") .OR. \
491	isStrSubset( vNam(varn), "k_y")) then
492	check = False
493	end if
494
495	if (var .NE. "all") then
496	check = isStrSubset( var,","+vNam(varn)+"," )
497	end if
498
499	if(check) then
500
501	temp = f[:]->$vNam(varn)$
502	data = temp(start_time_step:end_time_step,0:dimz-1,:)
503
504	temp_att = f_att->$vNam(varn)$
505	a=getvardims(temp_att)
506	b=dimsizes(a)
507	delete(temp_att)
508
509	if (height_level(0) .NE. -1)then
510	do te=0,dimz-1
511	data(:,te,:) = temp(start_time_step:end_time_step,\
512	height_level(te),:)
513	end do
514	end if
515
516	data=data/(norm_y*norm_x)
517
518	do i=0,b-1
519	if (isStrSubset( a(i),"zu_sp" ))then
520	legend_label_z=legend_label_zu
521	if (height_level(0) .NE. -1)then
522	z=zuh
523	else
524	z=zu
525	end if
526	else
527	if (isStrSubset( a(i),"zw_sp" ))then
528	legend_label_z=legend_label_zw
529	if (height_level(0) .NE. -1)then
530	z=zwh
531	else
532	z=zw
533	end if
534	end if
535	end if
536	end do
537
538	if (check_vType) then
539	min_y=new(dimz,double)
540	max_y=new(dimz,double)
541	else
542	min_y=new(dimz,float)
543	max_y=new(dimz,float)
544	end if
545	min_x=new(dimz,double)
546	max_x=new(dimz,double)
547
548	plot_h = new(dimz,graphic)
549
550	if (isStrSubset(vNam(varn),"x"))then
551	x_axis = new((/dimz,dimx/),double)
552	do q=0,dimz-1
553	x_axis(q,:) = f_att->k_x
554	x_axis = x_axis/norm_x
555	end do
556	if (norm_x .NE. 1.)then
557	res@tiXAxisString = "k~B~x~N~ ("+unit_x+")"
558	else
559	if (norm_height .EQ. 1)then
560	res@tiXAxisString = "k~B~x~N~ x z (1"
561	else
562	res@tiXAxisString = "k~B~x~N~ (1/m)"
563	end if
564	end if
565	dim_r=dimx
566	else
567	x_axis=new((/dimz,dimy/),double)
568	do q=0,dimz-1
569	x_axis(q,:) = f_att->k_y
570	x_axis = x_axis/norm_x
571	end do
572	if (norm_x .NE. 1.)then
573	res@tiXAxisString = "k~B~x~N~ ("+unit_x+")"
574	else
575	if (norm_height .EQ. 1)then
576	res@tiXAxisString = "k~B~x~N~ x z (1)"
577	else
578	res@tiXAxisString = "k~B~x~N~ (1/m)"
579	end if
580	end if
581	dim_r=dimy
582	end if
583
584	if (sort .EQ. "time")
585	res@xyLineColors = color
586	res@pmLegendDisplayMode = "Always"
587	res@pmLegendSide = "Top"
588	res@pmLegendParallelPosF = 1.2
589	res@pmLegendOrthogonalPosF = -1.0
590	res@pmLegendWidthF = 0.12
591	res@pmLegendHeightF = 0.04*\
592	(end_time_step-start_time_step+1)
593	do p=dimz-1,0,1
594	if (log_y .EQ. 1)then
595	do q=0,dimt-1
596	do r=0,dim_r-1
597	if (data(q,p,r) .EQ. 0)then
598	st=p+start_time_step
599	print(" ")
600	print("'"+vNam(varn)+"("+st+","+q+","+r+")' is "+\
601	"equal 0. Logarithmic scale for y-axis "+\
602	"and height "+z(p)+" cannot be used")
603	print(" ")
604	res@trYLog = False
605	end if
606	end do
607	end do
608	end if
609	res@gsnLeftString = vNam(varn)
610	res@gsnRightString = "Height = "+z(p)+"m"
611	res@tiYAxisString = "("+unit_y+")"
612	res@xyExplicitLegendLabels = legend_label
613	if (norm_height .EQ. 1)then
614	data(:,p,:)=data(:,p,:)*doubletofloat(z(p))
615	x_axis(p,:) = x_axis(p,:)*z(p)
616	end if
617	res@trXMinF = min(x_axis(p,:))
618	res@trXMaxF = max(x_axis(p,:))
619	plot(n) = gsn_csm_xy(wks,x_axis(p,:),data(:,p,:),res)
620	n=n+1
621	end do
622	else
623	if (sort .EQ. "height")
624	do p=0,dimt-1
625	do q=0,dimz-1
626	do r=0,dim_r-1
627	if (data(p,q,r) .EQ. 0)then
628	st=p+start_time_step
629	print(" ")
630	print("'"+vNam(varn)+"("+st+","+q+","+r+")' "+\
631	"is equal 0. Logarithmic scale for y-axis "+\
632	"and time "+legend_label(p)+" h cannot be used")
633	print(" ")
634	res@trYLog = False
635	end if
636	end do
637	if (norm_height .EQ. 1 .AND. p .EQ. 0)then
638	data(p,q,:) = data(p,q,:)*\
639	doubletofloat(legend_label_z(q))
640	x_axis(q,:) = x_axis(q,:)*\
641	doubletofloat(legend_label_z(q))
642	end if
643	max_y(q)=max(data(p,q,:))
644	min_y(q)=min(data(p,q,:))
645	min_x(q)=min(x_axis(q,:))
646	max_x(q)=max(x_axis(q,:))
647	end do
648	do q=0,dimz-1
649	res@xyLineColor = color(q)
650	if (dash .EQ. 1)then
651	res@xyDashPattern = q
652	end if
653	if (q .EQ. 0)then
654	res@tiYAxisString = "("+unit_y+")"
655	res@gsnLeftString = vNam(varn)
656	res@gsnRightString = "Time = "+legend_label(p)+"h"
657	res@trXMinF = min(min_x)
658	res@trXMaxF = max(max_x)
659	res@trYMinF = min(min_y)
660	res@trYMaxF = max(max_y)
661
662	plot_h(q) = gsn_csm_xy(wks,x_axis(q,:),\
663	data(p,q,:),res)
664
665	lgres = True
666	if (dash .EQ. 0)then
667	lgres@lgMonoDashIndex = True
668	else
669	lgres@lgDashIndexes = ispan(0,dimz-1,1)
670	end if
671	if (black .EQ. 1)then
672	lgres@lgMonoLineColors = True
673	else
674	lgres@lgLineColors = color
675	end if
676	lgres@lgTitleString = "Height (m)"
677	lgres@lgLabelFont = "helvetica"
678	lgres@lgLabelFontHeightF = font_size_legend*6
679	lgres@lgTitleFontHeightF = font_size
680	lgres@vpWidthF = 0.12
681	lgres@vpHeightF = font_size_legend*(dimz+3)
682
683	lbid = gsn_create_legend(wks,dimz,legend_label_z,lgres)
684
685	amres = True
686	amres@amParallelPosF = 0.75
687	amres@amOrthogonalPosF = 0.15
688	annoid1 = gsn_add_annotation(plot_h(q),lbid,amres)
689	else
690	plot_h(q) = gsn_csm_xy(wks,x_axis(q,:),\
691	data(p,q,:),res)
692	overlay(plot_h(0),plot_h(q))
693	end if
694	end do
695	plot(n)=plot_h(0)
696	n=n+1
697	end do
698	end if
699	end if
700	delete(data)
701	delete(temp)
702	delete(x_axis)
703	delete(min_x)
704	delete(max_x)
705	delete(min_y)
706	delete(max_y)
707	delete(plot_h)
708	end if
709	end do
710
711	if (n .EQ. 0) then
712	print(" ")
713	print("The variables 'var="+var+"' do not exist on your input file;")
714	print("be sure to have one comma berfore and after each variable")
715	print(" ")
716	exit
717	end if
718
719	; ***************************************************
720	; merge plots onto one page
721	; ***************************************************
722
723	resP = True
724	resP@gsnMaximize = True
725	resP@gsnPanelXWhiteSpacePercent = 4.0
726	resP@gsnPanelYWhiteSpacePercent = 4.0
727	resP@txFont = "helvetica"
728	resP@txString = f_att@title
729	resP@txFuncCode = "~"
730	resP@txFontHeightF = 0.0105
731
732	no_frames = 0
733
734	if ((format_out .EQ. "eps" .OR. format_out .EQ. "epsi") .AND. \
735	n .gt. no_rows*no_columns) then
736	gsn_panel(wks,plot,(/n,1/),resP)
737	print(" ")
738	print("Outputs to .eps or .epsi have only one frame")
739	print(" ")
740	else
741	do i = 0,n-1, no_rows*no_columns
742	if( (i+no_rows*no_columns) .gt. (n-1)) then
743	gsn_panel(wks,plot(i:n-1),(/no_rows,no_columns/),resP)
744	no_frames = no_frames + 1
745	else
746	gsn_panel(wks,plot(i:i+no_rows*no_columns-1),\
747	(/no_rows,no_columns/),resP)
748	no_frames = no_frames + 1
749	end if
750	end do
751	end if
752
753	if (format_out .EQ. "png" ) then
754	png_output = new((/no_frames/), string)
755	j = 0
756
757	if (no_frames .eq. 1) then
758	if (ncl_version .GE. 6 ) then
759	png_output(0) = file_out+".png"
760	else
761	png_output(0) = file_out+".00000"+1+".png"
762	end if
763	;using imagemagick's convert for reducing the white
764	;space around the plot
765	cmd = "convert -geometry 1000x1000 -density 300 -trim " + \
766	png_output(0) + " " + png_output(0)
767	system(cmd)
768	else
769
770	do i=0, no_frames-1
771	j = i + 1
772	if (j .LE. 9) then
773	png_output(i) = file_out+".00000"+j+".png"
774	end if
775	if (j .GT. 9 .AND. j .LE. 99) then
776	png_output(i) = file_out+".0000"+j+".png"
777	end if
778	if (j .GT. 99 .AND. j .LE. 999) then
779	png_output(i) = file_out+".000"+j+".png"
780	end if
781	if (j .GT. 999) then
782	png_output(i) = file_out+".00"+j+".png"
783	end if
784
785	;using imagemagick's convert for reducing the white
786	;space around the plot
787	cmd = "convert -geometry 1000x1000 -density 300 -trim " + \
788	png_output(i) + " " + png_output(i)
789	system(cmd)
790	end do
791	end if
792
793	print(" ")
794	print("Output to: "+ png_output)
795	print(" ")
796	else
797	print(" ")
798	print("Output to: " + file_out +"."+ format_out)
799	print(" ")
800	end if
801
802	end

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