Creating file names for save command

2016 10 6
2 个回答
更新时间：2018 8 25
14 次查看（30 天）

1 个投票

I have the following code:
file_dir = 'C:\Users\mydir';
datestamp=string(datetime('now','TimeZone','local','Format','yyyyMMdd_HHmmss'));
file_name=strcat(file_dir,'sps_',datestamp,'.mat');
save(file_name);
which returns the following error:
Error using save
Argument must contain a character vector.
Not sure how to fix this?

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Paul Nel
Paul Nel 2016-10-6
Also tried this modification with out success. Same error although it does appear to generate a character vector..
file_name=sscanf(strcat(file_dir,'sps_',datestamp,'.mat'),'%s');
Nagabhushan SN
Nagabhushan SN 2018-8-25
Same error:
save('temp.mat', data);
Error using save
Must be a string scalar or character vector.

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回答（2 个）

KSSV
KSSV 2016-10-6
编辑：KSSV 2016-10-6

1 个投票

You have to put some data in the file....
file_dir = pwd;
datestamp=string(datetime('now','TimeZone','local','Format','yyyyMMdd_HHmmss'));
file_name=strcat(file_dir,filesep,'sps_',datestamp,'.mat');
data = rand(10,10) ;
save(file_name,'data');

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Paul Nel
Paul Nel 2016-10-6
Unfortunately this is not the problem. As I see it the problem seems to be with the data type of the file name which I struggle to convert to a character vector.
KSSV
KSSV 2016-10-6
Yes it is a warning....
Try:
datestamp=char(datetime('now','TimeZone','local','Format','yyyyMMdd_HHmmss'));
instead of
datestamp=string(datetime('now','TimeZone','local','Format','yyyyMMdd_HHmmss'));
Paul Nel
Paul Nel 2016-10-6
Same result unfortunately
KSSV
KSSV 2016-10-6
How about replacing:
file_name=strcat(file_dir,filesep,'sps_',datestamp,'.mat');
with
file_name=char(strcat(file_dir,filesep,'sps_',datestamp,'.mat'));
Jan
Jan 2016-10-6
Prefer fullfile to join path and file names.

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Thorsten
Thorsten 2016-10-6
编辑：Thorsten 2016-10-6

0 个投票

file_dir = 'C:\Users\mydir';
datestamp=char(datetime('now','TimeZone','local','Format','yyyyMMdd_HHmmss'));
file_name=strcat(file_dir,'sps_',datestamp,'.mat');
>> whos file_name
Name Size Bytes Class Attributes
file_name 1x37 74 char
This works for me.

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