can not subplot wind rose

Question

Zach 2012-3-15

1
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/32381-can-not-subplot-wind-rose

评论： Walter Roberson 2017-7-26

I have to plot 3 pictures on one sheet, I do:

subplot(1,3,1)
contourf(piture 1)
subplot(1,3,2)
contourf(piture 2)
subplot(1,3,3)
wind_rose(dir,spd)

But result is wrong (like Matlab does not understand the 3-rd subplot and plots it separated on above the other subplots):

https://docs.google.com/open?id=0B51ZU50t_ZgXTjVINzdDV1BTd0t6d2lWX3IxWjV3dw

without wind_rose comand it works normaly: https://docs.google.com/open?id=0B51ZU50t_ZgXd1FwS2pBSlpRS1dCNkFwVHlCd3ZoUQ

But I need: https://docs.google.com/open?id=0B51ZU50t_ZgXUC01a19MZC1TSWFRY0gxeGZkODZSdw

How to get that? Please help!

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Sean de Wolski 2012-3-15

What is wind_rose? Does it specify an axes somewhere in its first few lines?

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Answer 1

Walter Roberson 2012-3-15

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/32381-can-not-subplot-wind-rose#answer_40926

在 MATLAB Online 中打开

wind_rose appears to be http://www.mathworks.com/matlabcentral/fileexchange/17748-windrose

The documentation for which says,

        -ax, to place wind rose on pervious axes, the input for ax
             must be [theax x y width], where theax is the previous
             axes, x and y are the location and width is the wind
             rose width relative to theax width (default=1/5)
        -parent, by default a new axes is created unless parent is
                 given, ex, parent may be a subplot

This suggests to me that the appropriate call Zach wants would be

wind_rose(dir,spd, '-parent', gca)

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João Paulo Ferreira 2017-7-26

在 MATLAB Online 中打开

Walter, is it possible to record the rose in .PNG with the white background to transparent? I usually record the figure with the command below, but I do not know how to leave the background transparent.

set(gcf,'PaperUnits','centimeters','PaperPosition',[0 0 30 20]); % A4 maximized landscape
print('-dpng',fullfile(fname,filename),'-r300'); % 300 are the DPI

Thanks if you can help.

Walter Roberson 2017-7-26

在 MATLAB Online 中打开

If I recall, export_fig from the File Exchange can handle transparency in PNG. This corresponds logically to doing a screen grab of the figure and setting the Alpha or the Transparency https://www.mathworks.com/help/matlab/ref/imwrite.html#input_argument_d0e485690 properties . You can thus do the same thing by using

cdata = print('-RGBImage', '-r300');

and then imwrite() cdata to the file specifying 'Transparency' and the RGB value of the background color you wish to make transparent.

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