how to change colorbar's color to continuous

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Li Xue 2018-5-8

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https://ww2.mathworks.cn/matlabcentral/answers/399662-how-to-change-colorbar-s-color-to-continuous

评论： Ameer Hamza 2018-5-8

采纳的回答： Ameer Hamza

data.csv

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Hi, I generated the following plot:

But the colorbar ticks are not corresponds to each color. For example, 2 is inside of one color. Is it possible to change the colorbar to continuous?

Also, my matrix does not have negative values. I would like to use more levels of red colors to describe my data and only one level of blue for show negative.

Here is my code:

A=readtable('data.csv');
B=table2array(A(:,2:end));
heatmap_obj=HeatMap(B,'Colormap',redbluecmap)
h=plot(heatmap_obj)
hcb=colorbar(h);

Data is attached.

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采纳的回答

Ameer Hamza 2018-5-8

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/399662-how-to-change-colorbar-s-color-to-continuous#answer_319218

编辑：Ameer Hamza 2018-5-8

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This is happening because you are using matrix redbluecmap as the color map, and this matrix only contains 11 colors. Either run the code with default colormap like this

heatmap_obj=heatmap(B)

or increase the number of colors in redbluecmap.

Edit:

the final code after discussion in comment is:

A=readtable('data.csv');
B=table2array(A(:,2:end));
cmap = redbluecmap;
newCmap = imresize(cmap, [64, 3]);  % original color map contain just 11 colors, this increase it to 64
newCmap = min(max(newCmap, 0), 1);
heatmap_obj=HeatMap(B,'Colormap', newCmap);
h=plot(heatmap_obj);
hcb=colorbar(h);