Getting an array from another function

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Patrick Lydon
Patrick Lydon 2017-7-11
评论： Star Strider 2017-7-11
Basically, I have a function called read_tsf which reads a time stamp file that you choose and puts it into a 48x1 matrix. I am currently writing a program that analyzes data and plots it accordingly. I need to use the time stamp file matrix in this code to mark points on the plot. I tried just calling the function in the code "read_tsf;" and then tried retrieving the matrix later in the code "tsf_dbl();" but it gives me an error saying "Undefined function or variable 'tsf_dbl'." So I am obviously doing this wrong. How do I use my function read_tsf in order to retrieve the matrix and use it in another program? Thank you.

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Star Strider
Star Strider 2017-7-11
You did not say how you are calling either ‘read_tsf’ or ‘tsf_dbl’. Functions have their own workspaces that they do not share with the base workspace. Your ‘read_tsf’ function must output the vector to the base workspace in order for other functions to use it.
Try something like this:
ts_vct = read_tsf(filename);
ts_num = tsf_dbl(ts_vct);
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Guillaume
Guillaume 2017-7-11
That function is really not well written. Here is a better version with all the useless operations removed:
function timestamps = read_tsf(filepath)
%Imports & parses data from BINARY TimeFile
%filepath: full path of file to read. If not specified or empty, the function prompts for a file
if nargin == 0 || isempty(filepath)
[filename, path] = uigetfile({'*.tsf', 'All Files (*.tsf)'}, 'Choose a Binary Data File');
if filename == 0
error('operation cancelled by user');
end
filepath = fullfile(path, filename);
end
fid = fopen(filepath, 'r', 'l');
if fid == -1
error('Failed to open file %s', filepath);
end
timestamps = fread(fid, Inf, 'double');
fclose(fid);
end
To use that function you have to give it an output. e.g. in your code:
tsf_dbl = read_tsf; %function will prompt for file
%or
tsf_dbl = read_tsf('C:\somewhere\somefile') %function will read specified file

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