Trouble using the system command with special characters
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Hi,
I am having trouble using the system command to convert a group of png files (using the wildcard symbol) to a gif using ImageMagick, but within a MATLAB script.
Here is the code that is not working:
datenum = str2num(num);
system('convert −delay 65 −loop 0 [ea,'_',KXXX,'_',datenum(1:end-1),'*_',varplotted,'.png'] [ea,'_',KXXX,'_',datenum,'_',varplotted,'.gif']');
And here is the error when I type just the command in MATLAB interactive mode:
>> 'convert -delay 65 -loop 0 [ea,'_',KXXX,'_',datenum(1:end-1),'*_',varplotted,'.png'] [ea,'_',KXXX,'_',datenum,'_',varplotted,'.gif']'
'convert -delay 65 -loop 0 [ea,'_',KXXX,'_',datenum(1:end-1),'*_',varplotted,'.png'] [ea,'_',KXXX,'_',datenum,'_',varplotted,'.gif']'
|
Error: Invalid text character. Check for unsupported symbol, invisible character, or
pasting of non-ASCII characters.
Thanks!
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回答(2 个)
Sulaymon Eshkabilov
2021-10-19
One ' sign is missing before 1st comma ","
datenum = str2num(num);
system('convert −delay 65 −loop 0 [ea','_',KXXX,'_',datenum(1:end-1),'*_',varplotted,'.png'] [ea,'_',KXXX,'_',datenum,'_',varplotted,'.gif']');
per isakson
2021-10-19
编辑:per isakson
2021-10-19
You try to call system() with a sequence of several input arguments and assumes that system() shall join these arguments to the command. system() doesn't work that way.
From the documentation of system
where command should be a scalar string or a character vector.
Thus you need to build ONE character vector (or string scalar), which comprises all parts of the command. Since your command is so long, I propose that you create three variables and finally concatenate them with horzcat().
cmd_1 = 'convert −delay 65 −loop 0 ';
file1 = [ea','_',KXXX,'_',datenum(1:end-1),'*_',varplotted,'.png'];
file2 = [ea,'_',KXXX,'_',datenum,'_',varplotted,'.gif'];
Before you concatenate them, each one must be a character vector. This code will throw several errors, but it's a beginning.
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