Work with variable names in workspace that are mostly the same with a unique identifier at the end

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Michael Wyciechowski 2022-9-22

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回答： Chunru 2022-9-23

I have a data aquisition system that will automatially convert to a .mat file. However when it does it places a unique identifier based on the unique time stamps associated with that signal.

For example:

PressureSignal_t143 is associated with another variable with a set of time stamps called t143,

Unfortunately the way the logger collected the data this changes with amost every log file. So the next file might be

PressureSignal_t152 and is associated with another variable with a set of time stamps called t152

While its easy to loop through files and run analyis, I've struggled with the constantly changing variable names.

With 20 or so variables and 50 or so files things could get pretty messy.

Any help is greatly appriciated.

Some of the code I've tried:

load(filename, '-regexp', '^PressureSignal')
w = who('-regexp','PressureSignal');
wname = cell2str(w)
tid = wname(end-3:end)

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Michael Wyciechowski 2022-9-23

Thank you for your thoughts. I'm still struggling a bit, not really sure how to utilize the "contains" function here because it seems to require a string or char as an input, which I'd have to create based on the variable name. Maybe I'll include more information. As you can see I've cheated a bit in the code by including the t143 identifier, just so it would run. This would be a manual operation which I'm trying to avoid. You can see this if you try to run the same code for SampleData2.mat, which has t145 and PressureSignal_t145. What would it take to simply plot the pressure signals in each of the 2 sample files, based only on the text "PressureSignal".

% Sample m-file

clear;clc;

load('SampleData1.mat');

% load('SampleData2.mat');

str = getVarName(PressureSignal_t143);

TF = contains(str,'PressureSignal')

TF = logical

1

plot(PressureSignal_t143)

function out = getVarName(var)

out = inputname(1);

end

Jeff Miller 2022-9-23

Use

a = load('SampleData1.mat');
varNames = fieldnames(a);

to get the variable names as strings. Then you can write something like:

if contains(varNames{1},'PressureSignal')
    plot(a.(varNames{1}))
end

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Answer 1

Chunru 2022-9-23

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1810360-work-with-variable-names-in-workspace-that-are-mostly-the-same-with-a-unique-identifier-at-the-end#answer_1059040

clear;clc;

%s = load('SampleData1.mat'); % load as a struct

s = load('SampleData2.mat');

% figure out the varname

sf = fields(s);

varname = sf{contains(sf, 'PressureSignal')};

% retrive the variable

P = s.(varname);

plot(P)

title(varname)

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