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

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

Answer 1

[Geoff Hayes]

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)

[Geoff Hayes]

Ashehad's answer moved here

Thanks, Geoff - it works! Yes, the replacePAR function had been written for MAESTRA/MAESPA input files.

[Geoff Hayes]

Glad it worked, Ashehad!