How can I output only part of a array?

Question

N/A 2022-6-22

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1745575-how-can-i-output-only-part-of-a-array

回答： Voss 2022-7-3

I wrote a code that plots a function for me. In the code, an array is given the name of the selected file. Example: FileName = 'Evaluation_114_1688.xlsm'

I would now like to save the figure as a jpg, which is why I used the command: saveas(gcf,FileName,'jpg')

But I would like to use only the numbers from the file name: 114_1688.jpg

How is it possible for me to select only the numbers from the file name?

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

KSSV 2022-6-22

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1745575-how-can-i-output-only-part-of-a-array#answer_990760

在 MATLAB Online 中打开

FileName = ['114_1688','.jpg'] ; 
saveas(gcf,FileName) 

2 个评论
显示无隐藏无

N/A 2022-6-22

But everytime I run the code, I chose a other file. That means that the FileName is constantly changing. I need a command that recognizes the numbers in the array and names the jpg only after the numbers.

KSSV 2022-6-22

在 MATLAB Online 中打开

[filepath,name,ext] = fileparts('Evaluation_114_1688.xlsm') ; 
FileName = strcat(name,'.jpg') ;
saveas(gcf,FileName) 

请先登录，再进行评论。

Answer 2

Voss 2022-7-3

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1745575-how-can-i-output-only-part-of-a-array#answer_999115

在 MATLAB Online 中打开

This may work for you:

FileName = 'Evaluation_114_1688.xlsm';
new_name = regexp(FileName, '_([\d_]+\.)', 'tokens', 'once');
%                            ^              leading underscore
%                              ^^^^^^       followed by one or more (+) digit (\d == 0-9) or underscore (_) characters
%                                    ^^     followed by a period
%                             ^        ^    group everything after the leading underscore, up to and including the period, in a "token" to be returned
new_name = [new_name{1} 'jpg']
new_name = '114_1688.jpg'