Is it possible to have a zero value in the pie-chart data in MATLAB 7.6 (R2008a)?

Question

MathWorks Support Team 2009-6-27

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/91752-is-it-possible-to-have-a-zero-value-in-the-pie-chart-data-in-matlab-7-6-r2008a

回答： KAE 2019-11-6

When plotting a pie-chart with any one of the data values as zero and a user-defined colormap,unexpected colors are skipped. I also get a warning message

"Warning: Ignoring non-positive data in pie chart."

With first value as 0, it skips green(second value on colormap)

Dat = [0 10 20 40]
t1col = [1 0 0];   %red        
t2col = [0 1 0];   %green
t3col = [0 0 1];   %blue
t4col = [1 0 1];   %magenta
tilecolor = [t1col; t2col; t3col; t4col]; 
pie(Dat)
colormap(tilecolor)

With second value as 0, it skips green again

dat = [5 0 20 40]
t1col = [1 0 0];   %red        
t2col = [0 1 0];   %green
t3col = [0 0 1];   %blue
t4col = [1 0 1];   %magenta
tilecolor = [t1col; t2col; t3col; t4col]; 
pie(dat)
colormap(tilecolor)

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Answer 1

MathWorks Support Team 2009-6-27

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/91752-is-it-possible-to-have-a-zero-value-in-the-pie-chart-data-in-matlab-7-6-r2008a#answer_101103

pie_modified.m

The ability to handle zero values in pie-chart is not available in MATLAB 7.6 (R2008a).

To work around this issue, use the attached function pie_modified(dat,tilecolor)

where variable 'Dat' is the data values for the pie chart and variable 'tilecolor' is the colormap for it. For example:

Dat = [0 10 20 40]
t1col = [1 0 0];   %red        
t2col = [0 1 0];   %green
t3col = [0 0 1];   %blue
t4col = [1 0 1];   %magenta
tilecolor = [t1col; t2col; t3col; t4col]; 
pie_modified(Dat,tilecolor)