how to read a .txt file and change the value of a parameter in that file

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Ashehad Ali
Ashehad Ali 2015-4-26
评论： Geoff Hayes 2015-4-27
Hi there,
I'm relatively new to Matlab. I'd like to read or maybe scan the attached paramin.txt file in Matlab and change the value of a parameter in that file and thus the file would contain the updated value of that parameter.
I've been able to do that quite easily in R using a "replacePAR" function as follows: For example, to change the current value of SLAA to 6, I'd just use the following syntax in R: replacePAR("paramin.txt",parname="SLAA", newval=6.0)
I'm wondering if there's an equivalent function in Matlab. Find attached the paramin.txt file that contains texts and values.
I'd appreciate your assistance.
Thanks, Ashehad

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Geoff Hayes
Geoff Hayes 2015-4-26
Ashehad - the replacePAR function seems to have been written for files of a certain format (MAESTRA/MAESPA input files). Is this the case? If so, you could try to find a similar MATLAB function from the File Exchange (though I couldn't find any submissions for files of this type).
A quick and (not so efficient) example is attached that works for the file that you have attached. It creates a temporary file and updates it with the new parameter value, and then replaces the original file with the new one. Just call it from the Command Window as
replacePAR('paramin.txt','SLAA',6.0)

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