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Error message while using if statement

Asked by Noah Wilson on 12 Jun 2019
Latest activity Commented on by dpb
on 12 Jun 2019
I am trying to create an if statement that will create a file "Rawdata" in my current directory but I also want it to check if the folder of that name already exists and only create the folder if it does not exist. Then I want to change my directory to that new folder and save a csv file to it.
The code I am using is as follows:
%Making new folder for raw data
fn = fullfile('Rawdata');
if
exist(fn, 'dir')
warning('This folder already exists')
else
mkdir(fn)
end
%Changing directory
cd('Rawdata');
%Writing new csv file to test folder
csvwrite('rawdata.csv',T3);
I am currently getting at error message right at the begining of the if statement saying "Invalid expression. Check for missing or extra characters." and then in the code is it telling me "Parse error. Usage might be invalid MATLAB syntax".
Any suggestions on what I am doing wrong or how to fix it would be greatly appreciated.

  1 Comment

dpb
on 12 Jun 2019
Other respondent answered the cause for the syntax error; I'll just note that
fn=fullfile('Rawdata');
is a "do nothing" statement as written-- fullfile only does something when given a qualifying path in addition to a filename string. Whether this is the intent or not is not known but is the effect...

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1 Answer

Answer by Prasanth Sikakollu on 12 Jun 2019
 Accepted Answer

Syntax of if conditional:
if expression
statements
else
statements
end
There should be no newline character between 'if' and expression.
The following code should work.
if exist(fn, 'dir') % if expression
warning('This folder already exists') % Statements
else % else
mkdir(fn) %Statements
end

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