How to plot elements of a structure?

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Alex 2018-9-13

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https://ww2.mathworks.cn/matlabcentral/answers/418913-how-to-plot-elements-of-a-structure

编辑： Alex 2018-9-14

I have an array of structures that is 91x10 called B. Within each element of the array is a structure Bx, By, Bz. I want to create three pcolor plots of Bx, By and Bz. I'm not sure how to do this.

latitudes =1:1:10;
alt=1:1:91;
for j=1:length(latitudes)
for i=1:length(alt)
    B_igrf(:,1) = rand(3,1)
    B(i,j)=struct('Bx',B_igrf(1,1),'By',B_igrf(2,1),'Bz',B_igrf(3,1))
end
end
%map Bx
figure(2),pcolor(latitudes, alt, B.Bx)
xlabel('Time(time past.......','fontsize',24, 'fontweight','bold')
ylabel('Altitude (km)','fontsize',24, 'fontweight','bold');
xlabel(colorbar,'n_e(m^{-3})','fontsize',24, 'fontweight','bold')
set(gca,'FontSize',24)

Your help would be greatly appreciated!

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Bob Thompson 2018-9-13

在 MATLAB Online 中打开

As I understand it, when you want to work with all the elements of a field in a structure you need to concatenate them. Try:

pcolor(latitudes, alt, [B.Bx]);

No guarentees, just the first thing that came to mind.

If that doesn't work, are you getting any errors? If so, what are they?

Alex 2018-9-14

编辑：Alex 2018-9-14

在 MATLAB Online 中打开

The command you suggested gives the error "Color data input must be a matrix."

I solved the issue by using:

% magnetic field data
latitudes =1:1:10;
alt=1:1:91;
for j=1:length(latitudes)
for i=1:length(alt)
    B_igrf(:,1) = rand(3,1)
    Bx(i,j)= B_igrf(1,1);
    By(i,j)= B_igrf(2,1);
    Bz(i,j)= B_igrf(3,1);
end
end
% map Bx
figure(2),pcolor(latitudes, alt, Bx)
figure(3),pcolor(latitudes, alt, By)
figure(4),pcolor(latitudes, alt, Bz)