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cts18488
United Kingdom
83 Posts |
 Posted - 11/17/2021 : 1:28:51 PM
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Hi,
I am using the following code to generate a heatmap, however it is either the colour or the axes that are off. This is the code that I am using.
arr_x = np.array([[1, 2], [3, 4], [5, 6], [7, 8]])
wks = op.new_sheet(type='m')
wks.from_np(arr_x)
gr = op.new_graph(template=op.path('e') + 'test_3map.otpu')
gl_1 = gr[0]
p1 = gl_1.add_mplot(wks, 0, type = 105)
gl_1.set_ylim(0.5, 4.5, 1)
gl_1.set_xlim(0.5, 2.5)
If I am using this, the x and y axes are correct, however the heatmap and the scale is not correct.
If instead of gl_1.set_xlim/ylim I am using gl_1.rescale(), the heatmap and scale are correct. Is this a way to fix this?
I am attaching few images as a proof, and a way how I can change this in Origin - if it is possible to do the same from Python straight?
Also, is there a user-manual, where it describes what each function do and how to use it with all the options? (for Python)
Thank you,
Tibi
PS: Please let me know if something is unclear.
Origin Ver.2021b and Service Release SR2
Operating System: Win 10 Ent
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Edited by - cts18488 on 11/17/2021 1:31:23 PM |
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cpyang
USA
1406 Posts |
Posted - 11/17/2021 : 4:35:10 PM
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Here
import originpro as op
import numpy as np
arr_x = np.array([[1, 2], [3, 4], [5, 6], [7, 8]])
wks = op.new_sheet(type='m')
wks.from_np(arr_x)
x1,x2,y1,y2 = 0.5, 2.5, 0.5, 4.5
wks.xymap = x1,x2,y1,y2
gr = op.new_graph(template='Heat_Map.otpu')
gl_1 = gr[0]
plot = gl_1.add_mplot(wks, 0, type = 105)
#heatmap is showing data point at the center, so need to adjust for half step size
hs = 0.5 * (x2-x1)/2;
gl_1.set_ylim(y1-hs, y2+hs, 1)
gl_1.set_xlim(x1-hs, x2+hs, 1)
#set plot colormap
z = plot.zlevels
z['minors'] = 2
z['levels'] = [1, 3,7, 8]
plot.zlevels = z
plot.colormap = 'BlueYellow.pal'
I also put this into Originlab Github sample codes area
https://github.com/originlab/Python-Samples/blob/main/4.%20Graphing/Plot%20Heatmap%20from%20Matrix%20Data.py
CP
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cts18488
United Kingdom
83 Posts |
Posted - 11/19/2021 : 10:14:36 AM
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Thank you. It is working so nice.
quote:
Originally posted by cpyang
Here
import originpro as op
import numpy as np
arr_x = np.array([[1, 2], [3, 4], [5, 6], [7, 8]])
wks = op.new_sheet(type='m')
wks.from_np(arr_x)
x1,x2,y1,y2 = 0.5, 2.5, 0.5, 4.5
wks.xymap = x1,x2,y1,y2
gr = op.new_graph(template='Heat_Map.otpu')
gl_1 = gr[0]
plot = gl_1.add_mplot(wks, 0, type = 105)
#heatmap is showing data point at the center, so need to adjust for half step size
hs = 0.5 * (x2-x1)/2;
gl_1.set_ylim(y1-hs, y2+hs, 1)
gl_1.set_xlim(x1-hs, x2+hs, 1)
#set plot colormap
z = plot.zlevels
z['minors'] = 2
z['levels'] = [1, 3,7, 8]
plot.zlevels = z
plot.colormap = 'BlueYellow.pal'
I also put this into Originlab Github sample codes area
https://github.com/originlab/Python-Samples/blob/main/4.%20Graphing/Plot%20Heatmap%20from%20Matrix%20Data.py
CP
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cts18488
United Kingdom
83 Posts |
Posted - 11/25/2021 : 5:15:12 PM
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Hi,
I have one more question: is it possible to for colourbar to specify only the minimum and the maximum and the rest to be picked up by the Origin?
I have tried z['levels'] = [-8, 8], but it didn't work as I want, the colour stayed the same of template.
I appreciate the help.
Tibi |
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cpyang
USA
1406 Posts |
Posted - 11/25/2021 : 9:52:28 PM
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Looks like there is a bug there, if you have at least one intermediate level, then it works, like [-8,0,8]
We can fix this next version.
CP
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cts18488
United Kingdom
83 Posts |
Posted - 11/26/2021 : 06:36:48 AM
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Hi,
Thank you for that.
In the image attached I have shown what I want to do. The first heatmap is the one I can generate now. The one is the one using the intermediate (I am don't really like as there are not so many intermediates in the colour bar). The third one is a modification of the first one on which I have changed manually the minimum and maximum value.
If that can be achieved (the third heatmap) in the next update, that would be fantastic.
Regards,
Tibi
quote:
Originally posted by cpyang
Looks like there is a bug there, if you have at least one intermediate level, then it works, like [-8,0,8]
We can fix this next version.
CP
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cpyang
USA
1406 Posts |
Posted - 11/26/2021 : 11:23:00 AM
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Looks to me you just want more intermediate levels? Try increasing it? like
z['minors'] = 10
CP
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cpyang
USA
1406 Posts |
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cts18488
United Kingdom
83 Posts |
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Topic |
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Changing matrix dimensions and z-scale for plottin