'saveas' does not overwrite existing image file

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Julia
Julia 2018-11-6
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!
  1 个评论
Julia
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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Stephan
Stephan 2018-11-7
编辑：Stephan 2018-11-7
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
The date field in this structure is the last modification date.
Best regards
Stephan

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