App Designer change colormap

Question

Lev Mihailov 2022-5-18

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1722000-app-designer-change-colormap

回答： DGM 2022-5-18

I need to change the color map, but matlab gives me such a warning and creates an empty graph

Specify a UIAxes handle as first argument.
            imagesc(app.UIAxes,app.a,app.b,app.c);%  speedGPS
            gray2 = flipud(colormap('gray'));
            colormap(app.UIAxes,gray2)
            title(app.UIAxes,'Time live server(i)');
            ylabel(app.UIAxes,'temp, K');
            xlabel(app.UIAxes,'time, h');  

Thanks in advance

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

DGM 2022-5-18

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1722000-app-designer-change-colormap#answer_966315

在 MATLAB Online 中打开

I'm going to guess it's complaining about the missing handle on the gray2 line. If so, then do this:

gray2 = flipud(gray(256));

While it's possible, there isn't any need to call colormap() on that line. Since all you need is the colormap (the actual table of colors), just call the desired map generation function (i.e. gray()) with the desired table length. The result will be a simple numeric array, and doesn't attempt to interact with any graphics objects in the process.