How do I create a logarithmic scale colormap or colorbar?
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MathWorks Support Team
am 6 Jul. 2012
Bearbeitet: Rena Berman
am 22 Nov. 2023
I need to color 'surf' plots on a log scale and subsequently displace the log-based colorbar.
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MathWorks Support Team
am 22 Nov. 2023
Bearbeitet: MathWorks Support Team
am 22 Nov. 2023
Please follow the steps below to create a log colobar in 'surf' plot:
% Plot the surface plot
[X, Y] = meshgrid(1:0.5:10,1:20);
Z = sin(X) + cos(Y);
figure;
surf(X, Y, Z)
% Show the colorbar
colorbar
% Set the log colobar
set(gca,'ColorScale','log')
Note: This feature was introduced in MATLAB R2018a.
For more information, refer to the following documentation page, "Axes Properties":
https://www.mathworks.com/help/matlab/ref/matlab.graphics.axis.axes-properties.html#budumk7-ColorScale
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Weitere Antworten (2)
lvn
am 9 Nov. 2023
Bearbeitet: Rena Berman
am 22 Nov. 2023
set(gca,'ColorScale','log')
4 Kommentare
Walter Roberson
am 31 Mär. 2020
You can tell by the wording of the official answer that it was written for an older version of MATLAB.
Pat
am 11 Mai 2023
Bearbeitet: Walter Roberson
am 5 Sep. 2023
Hi Kristoffer Walker,
If you still need assistance with this issue, please create a MathWorks Technical Support Case. We would be happy to help you out.
Berthold Reisz
am 15 Mär. 2019
Try the following:
% let A be your data
A = 100*rand(100,100);
% plot log10 of A
pcolor(log10(A))
% get the minimum and maximum value of A
c1 = min(min(A));
c2 = max(max(A));
% set limits for the caxis
caxis([log10(c1) log10(c2)]);
% preallocate Ticks and TickLabels
num_of_ticks = 5;
Ticks = zeros(1,num_of_ticks);
TickLabels = zeros(1,num_of_ticks);
% distribute Ticks and TickLabels
for n = 1:1:num_of_ticks
Ticks(n) = log10(round(c2)/num_of_ticks*n);
TickLabels(n) = round(c2)/num_of_ticks*n;
end
% set Ticks and TickLabels
colorbar('Ticks',Ticks,'TickLabels',TickLabels)
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