필터 지우기
필터 지우기

How do I create a logarithmic scale colormap or colorbar?

조회 수: 1,384 (최근 30일)
I need to color 'surf' plots on a log scale and subsequently displace the log-based colorbar.

채택된 답변

MathWorks Support Team
MathWorks Support Team 2023년 11월 22일
편집: MathWorks Support Team 2023년 11월 22일
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

추가 답변 (2개)

lvn
lvn 2023년 11월 9일
편집: Rena Berman 2023년 11월 22일
  댓글 수: 4
Walter Roberson
Walter Roberson 2020년 3월 31일
You can tell by the wording of the official answer that it was written for an older version of MATLAB.
Pat
Pat 2023년 5월 11일
편집: Walter Roberson 2023년 9월 5일
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.

댓글을 달려면 로그인하십시오.


Berthold Reisz
Berthold Reisz 2019년 3월 15일
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)

카테고리

Help CenterFile Exchange에서 2-D and 3-D Plots에 대해 자세히 알아보기

제품


릴리스

R2018a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by