How to change the colorbar limits in a previously saved fig file

Question

Ricardo Duarte 2021-10-11

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1561631-how-to-change-the-colorbar-limits-in-a-previously-saved-fig-file

评论： Ricardo Duarte 2021-10-14

采纳的回答： Walter Roberson

在 MATLAB Online 中打开

Hello,

I have a figure containing a colorbar that I saved in a .fig format.

Now I need to open it and change the limits of the color bar. Im using

caxis([inferior_limit superior_limit])

.

However, when I do this nothing happens.

What Im doing wrong?

Thank you

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Answer 1

Walter Roberson 2021-10-11

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https://ww2.mathworks.cn/matlabcentral/answers/1561631-how-to-change-the-colorbar-limits-in-a-previously-saved-fig-file#answer_806431

在 MATLAB Online 中打开

figfilename = 'AppropriateFile.fig';
fig = openfig(figfilename);
cb = findobj(fig, 'type', 'Colorbar');
cb.Limits = [inferior_limit superior_limit];

After that you might want to save the figure indicates in fig into a new file.

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Ricardo Duarte 2021-10-12

编辑：Walter Roberson 2021-10-12

在 MATLAB Online 中打开

Hello Walter,

The code you provided allow me to change the colorbar limits however it doesn't change the colorgradient in my figure.

Please, have a look on my code

SPLfigure=figure; %Just for normal window size
%figure('units','normalized','outerposition',[0 0 1 1]); %FOR A MAXIMIZED WINDOW
ax1=axes;
imagesc(ax1,km2deg(Xv),km2deg(Yv),SPL_dB);
set(gca,'YDir','normal');
h=colorbar(ax1,'southoutside');
ylabel(h,'Sound Pressure Level (dB)');
clear title
title({['SPL Broadband'], ['Source at: [', num2str(km2deg(Sx)),';',num2str(km2deg(Sy)),'] ','/ Receiver layer at:', num2str(rd(rdindex)),'m deep']});
xlabel('LONGITUDE');
ylabel('LATITUDE');
axis tight;
clear title
ax2=axes;
contourf(ax2,km2deg(lon_km),km2deg(lat_km),elevation', [-rd(rdindex) -rd(rdindex)],'w','facecolor','w');
ax3=axes;
contourf(ax3,km2deg(lon_km),km2deg(lat_km),elevation', [0 0],'facecolor',[0.5 0.5 0.5]);
linkaxes([ax1,ax2,ax3]);
ax2.Visible = 'off';
    ax2.XTick = [];
    ax2.YTick = [];
ax3.Visible = 'off';
    ax3.XTick = [];
    ax3.YTick = [];    
set([ax1,ax2,ax3],'Position',[.17 .11 .685 .815]);
ax2.Visible = 'on';
ax2.Visible = 'off';
ax3.Visible = 'on';
ax3.Visible = 'off';
axes(ax1); axis equal;
axes(ax2); axis equal;
axes(ax3); axis equal;
hold on;
portugal=text((-8.6),(38.3),'Portugal','FontSize',20); 
set(portugal,'Rotation',90);
setubal=text((-9.0),(38.55),'Setubal','FontSize',14);
caxis(ax1,[0 200]);
ax1.XGrid         = 'on';
ax1.YGrid         = 'on';
ax1.GridColor = [1, 1, 1];  % [R, G, B]
hold on; contourf(km2deg(lon_km),km2deg(lat_km),elevation', [-50 -50],'w','ShowText','on','facecolor','none'); %linha dos 50m 
hold on; contourf(km2deg(lon_km),km2deg(lat_km),elevation', [-100 -100],'w','ShowText','on','facecolor','none'); %linha dos 100m
hold on; contourf(km2deg(lon_km),km2deg(lat_km),elevation', [-250 -250],'w','ShowText','on','facecolor','none'); %linha dos 250m 
%hold on; contourf(km2deg(lon_km),km2deg(lat_km),elevation', [-500 -500],'w','ShowText','on','facecolor','none'); %linha dos 500m 
hold on; contourf(km2deg(lon_km),km2deg(lat_km),elevation', [-1000 -1000],'w','ShowText','on','facecolor','none'); %linha dos 1000m 
hold on; plot(km2deg(Sx),km2deg(Sy),'.k');

Thank you in advance,

Walter Roberson 2021-10-13

在 MATLAB Online 中打开

imagesc() sets the image 'CDataMapping', 'scaled' . If a non-empty scale range is provided, then it also sets the axes CLim property to that range; if "hold" was off then it also sets the axes CLimMode to 'auto'

This is almost the same calling imagesc() without a range and then calling caxis() yourself; the difference is just in whether CLimMode is set to 'auto' or not (caxis does not set it.)

If you still have your figure up but you want to change the caxis and save again while it is still up, then referring to your previous code,

caxis(ax1, [inferior_limit superior_limit]);
savefig(SPLfigure, 'teste.fig')

Ricardo Duarte 2021-10-14

Thank you Walter!

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How to change the colorbar limits in a previously saved fig file

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