Trying to manually set rgb values of cells equal to 0 on contourf figure

Question

Christian 2019-6-26

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/469080-trying-to-manually-set-rgb-values-of-cells-equal-to-0-on-contourf-figure

回答： Austin M. Weber 2024-2-8

I am attempting to manually set the rgb values on the displayed heat map/2D graph created by contourf, taking data from my input array (a 33477x13 array) to a dark blue if the cell value is equal to 0. How would I do this?

Here is the code:

function [SMPS_data]=Contourf(A)
    i=1;
    while i<3
        start_date = {'5-June-19 0:00','26-May-19 0:01'};    
        t1 = datetime(2019,5,26,0,0,0);
        t2 = datetime(2019,6,4,0,0,0);
        dates=t1:minutes(10):t2;
        duration_min = numel(dates)*10;
        SMPS_timestep = [0:10:duration_min];
        colormap(jet)
        SMPS_data=[A];
        x=zeros(1,length(SMPS_data));
        for j=1:length(SMPS_data)
            x(1,j) = j/6;
        end
        y = [11.5;   15.4;   20.5;   27.4;   36.5;   48.7;   64.9;   86.6;   115.5;  154;    205.4;  273.8;  365.2];
        z_o=zeros(1,numel(x));
        z_r= SMPS_data(1:end,2:end).';
        z = [z_o;z_r];
        [X,Y] = meshgrid(x,y);
        v=logspace(-1,15,500);
        [X,Y] = meshgrid(x, y);
        figure
        [C,h] = contourf(X,Y,griddata(x,y,z,X,Y,'natural'),v);
        C(C==0)
        set(gca,'yscale','log')
        ylim([-1 250]);
        str=sprintf('Time (h), t(0) = %s', start_date{2});
        xlabel(str)
        ylabel('Particle diameter (\mum)')
        set(h,'LineStyle','none');
        c =colorbar;
        caxis([0 2500])
        hl = ylabel(c, 'dN/dlogDp #/cm^{-3}');
        set(hl, 'Rotation',90);
        set(c,'FontSize',12,'LineWidth',1.5)
        set(gca,'FontSize',12,'LineWidth',1.5)
        set(gca,'TickDir','out')
        set(gca,'XTickMode','auto')
        %set(gca, 'XTick',[0 6 12 18 24 30 36 42 48 54])
        set(gca, 'XTickLabel',{'5/26','5/27','5/28','5/29','5/30','5/31','6/1','6/2','6/3','6/4'})
        set(gca, 'YTick',[10 30 50 100 150 200])
        set(gca, 'YTickLabel',{'10','30','50','100','150','200'})
        box off
        i=i+1;
    end
end