Why does the FIGURE command create two figures when I set the colormap property in MATLAB 7.3 (R2006b)?

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MathWorks Support Team 2009-6-27

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https://ww2.mathworks.cn/matlabcentral/answers/96815-why-does-the-figure-command-create-two-figures-when-i-set-the-colormap-property-in-matlab-7-3-r2006

编辑： MathWorks Support Team 2015-7-22

I am creating a figure using the FIGURE command in MATLAB 7.3 (R2006b). When I set the 'Colormap' property of the figure to "gray" using the following statement:

h = figure('Colormap',gray);

two figures are generated instead of one.

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Answer 1

MathWorks Support Team 2015-7-22

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This behavior is expected, and is due to the following:

If there are no input arguments to GRAY, the colormap property value 'gray' will call GCF to get the default Colormap length, and this will create the new figure.

As a workaround, specify the colormap length in the command as follows:

h = figure('Colormap',gray(256));