'saveas' does not overwrite existing image file

Question

Julia 2018-11-6

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/428351-saveas-does-not-overwrite-existing-image-file

评论： Julia 2018-11-7

Hello!

My script plots some points on an image ('whatever.tif') and should subsequently save the resulting figure using 'saveas' (as 'whatever_points.tif'). This works fine if there is no file 'whatever_points.tif' in the output folder yet. If 'whatever_points.tif' exists already in this folder, nothing seems to happen, i. e. the figure is not saved. I would, however, like the script to overwrite the preexisting figure if there is one. I thought this was the default but it clearly doesn't seem to be?

This is what I use for saving:

filename_image = 'D:\somefolder\whatever.tif'
figure_name = [filename_image(1:end-4), '_points'];
figure_format = filename_image(end-2:end);
saveas(gcf,figure_name, figure_format);

Thanks for your help!

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Julia 2018-11-7

Sorry, I just found that it does actually overwrite the file. However, on Windows 8.1 the date of the last modification date of this file is not updated so you can't easily see when the file was last modified. Is there another way of obtaining this information?

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Answer 1

Stephan 2018-11-7

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https://ww2.mathworks.cn/matlabcentral/answers/428351-saveas-does-not-overwrite-existing-image-file#answer_345630

编辑：Stephan 2018-11-7

在 MATLAB Online 中打开

Hi,

see this contribution from Mathworks Support Team:

https://de.mathworks.com/matlabcentral/answers/102959-which-function-returns-the-date-when-a-file-was-last-modified-in-matlab-7-7-r2008b.

>> info = dir('Untitled.m')
info = 
    struct with fields:
         name: 'Untitled.m'
       folder: 'W:\Matlab\Projekte'
         date: '10-Jul-2018 16:32:29'
        bytes: 65
        isdir: 0
      datenum: 7.3725e+05