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 How to plot an " Image Plot" from a matrix		  New Topic  Reply to Topic
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cts18488

United Kingdom
83 Posts
Posted - 12/10/2024 :  5:12:53 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver. 2024b and Service Release (Select Help-->About Origin):
Operating System: Windows11

Hi,

Can you please tell me what is the code to plot an "Image Plot" from a matrix? Can you please add the code how to change the colour pallete and how to set the levels for the colour scale. Thank you!

ChaoC

USA
180 Posts
Posted - 12/10/2024 :  8:03:14 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hello,

1. You can activate your matrix and run: op.lt_exec('run.section(Plot3D.ogs,ImagePlot)')

2. Documentation for setting colormap:
https://docs.originlab.com/originpro/classoriginpro_1_1graph_1_1Plot.html#a5d33966d43e1be87689f6488d418a542

3. You can use lt_exec with these LabTalk options:
https://www.originlab.com/doc/LabTalk/ref/Layer-CMap-obj

E.g op.lt_exec('layer.cmap.nummajorLevels=8')
op.lt_exec('layer.cmap.setLevels(1)')

Best,
Chao
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minimax

351 Posts
Posted - 12/11/2024 :  09:35:56 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi cts18488,

Besides the lt_exec() method ChaoC mentioned, you may also try following

import originpro as op
ms=op.find_sheet('m', '[MBook1]')
gl = op.new_graph(template='image')[0]
gl.add_mplot(ms, z=0, type=220) #220 is image plot type id
#https://www.originlab.com/doc/zh/LabTalk/ref/Plot-Type-IDs
gl.rescale()

pl = gl.plot_list()[0]
zl = pl.zlevels
zl['minors'] = 4
zl['levels'] = [0, 8, 16, 24, 32]
pl.zlevels = zl
pl.colormap = 'Beach.pal'

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