set colormap values to an array
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Hello,
I have a 22x1 array that I'd like to assign to a colorscale (jet) so that each value has a corresponding corresponding color
>> colorpost
colorpost =
-1.4721
-11.3430
23.4227
7.0674
-2.7839
42.3308
-2.6353
0.1617
6.3158
-20.6096
2.6023
3.1703
5.8185
-4.1358
6.9481
-5.1080
24.6877
-5.1542
-17.9669
1.8017
-23.3427
-15.8499
But when I do the following it doesn't work
>> c=jet(colorpost)
Error using /
Matrix dimensions must agree.
Error in jet (line 23)
u = [(1:1:n)/n ones(1,n-1) (n:-1:1)/n]';
I've seen a similar problem here but it doesn't seem to help me since that array is all integers https://www.mathworks.com/matlabcentral/answers/897552-get-colormap-values-corresponding-to-array-values
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채택된 답변
Walter Roberson
2022년 11월 15일
colorpost = [
-1.4721
-11.3430
23.4227
7.0674
-2.7839
42.3308
-2.6353
0.1617
6.3158
-20.6096
2.6023
3.1703
5.8185
-4.1358
6.9481
-5.1080
24.6877
-5.1542
-17.9669
1.8017
-23.3427
-15.8499
];
cmap = jet();
numcol = size(cmap,1);
cps = floor(rescale(colorpost, 1, numcol));
colorized_cp = permute(cmap(cps,:), [1 3 2]);
image(colorized_cp)
추가 답변 (1개)
Image Analyst
2022년 11월 15일
Try this:
colorpost =[...
-1.4721
-11.3430
23.4227
7.0674
-2.7839
42.3308
-2.6353
0.1617
6.3158
-20.6096
2.6023
3.1703
5.8185
-4.1358
6.9481
-5.1080
24.6877
-5.1542
-17.9669
1.8017
-23.3427
-15.8499];
% Specify the number of colors to be the same as the number of elements in colorpost.
numColors = numel(colorpost)
% Create a colormap.
cmap = jet(numColors);
% Assume min value is cmap(1, :) and max value is cmap(end, )
% Get color sorted in the same way as colorpost (or you could make a dictionary)
[sortedColorpost, sortOrder] = sort(colorpost, 'ascend');
assignedColors = cmap(sortOrder, :);
Is it what you want?
댓글 수: 2
Walter Roberson
2022년 11월 15일
This assigns one color per element, even if two elements are close or even identical. The color is not proportional to the value.
The solution I gave scales entries according to relative value through the span of values, and so is suitable for color representing relative value.
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