changing the name of the csv files but getting errors

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muhammad choudhry
muhammad choudhry 2020-11-29
评论： Walter Roberson 2020-11-29
Hi, I am basically using command below to change the name of the bunch of the files!
movefile('oldname.csv','newname.csv')
I tried on one file as shown below and it works
%movefile('vel.0.csv','vel0.csv')......basically I am using one of the post processing software which is exporting files in decimals and matlab is giving me an error while reading the files.... so I want to change the name or remove the points. I tried to loop it but I am getting an error as you can see below I have files from vel.0.csv to vel.201.csv all i want to remove an extra decimal point from them so ti should be like vel0.csv t0 vel201.csv
Code tried so far:
% Get all files in the current folder clear all;
files = dir(fullfile('C:','Users','muhammad','Desktop','Velocity','*.csv'));
% Loop through each
for ii = 1:length(files)
movefile(vel.(ii).csv, vel(ii).csv'));
end
Error:
Error: File: renameFiles.m Line: 9 Column: 47
Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for
mismatched delimiters.

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采纳的回答

Walter Roberson
Walter Roberson 2020-11-29
folder = fullfile('C:','Users','muhammad','Desktop','Velocity');
files = dir( fullfile(folder, '*.csv') );
% Loop through each
for ii = 1:length(files)
in_name = files(ii).name;
%safety check instead of assuming there are definitely exactly two periods
dp = find(in_name == '.');
if length(dp) > 1
out_name = in_name;
out_name(dp(1:end-1)) = '';
movefile( fullfile(folder, in_name), fullfile(folder, out_name));
end
end
  2 个评论
muhammad choudhry
muhammad choudhry 2020-11-29
Thanks alot! your replys help alot to me.
What is this line doing, if you can give me little bit of explanation I be really grateful
(dp(1:end-1)) = '' %is it reading vel.0.csv.....how does the code know which period to be removed..your code exactly remove the period before the numbers....
Walter Roberson
Walter Roberson 2020-11-29
dp = find(in_name == '.');
is comparing character by character looking for periods, and the find() around that returns a list of indices where the periods are. dp(1:end-1) is then a list of where all the periods are except for the last one.
dp(1:end-1)) = '';
is then deleting all the positions corresponding to those periods.
This code does not assume that there are exactly 2 periods: it checks to be sure there are more than 1, and it removes all but the last one.

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