How to creat autoumaticly a file .mat without removing the last one

Hello !

I am doing a function when at the end i want to save the parametrers given by this function in a file .mat . The function works good but the problem is i save the new parameters in the same file wich means the last parameters are gone . so what i want is having a new file.mat with he new parametes in every use of the function, how shall i do , i am thinking of puting a name as a funnction's parameter and like that i will have a different name of the file whic means a new file but i dont know how i am using this line to creat my file

save Param.mat Param1 Param2

load Param.mat

i have these two lines at the end f my funch which taking in charge the calculation of Param1 Param2.

Thank you for your help.

Answer 1

[Adam Danz]

Here are some suggestions.

Input filename or file number

One of the function inputs can be the filename of the mat file.

function params(. . ., filename)
. . .
save(filename, 'Param1', 'Param2')
end

Similarly, if your data are organized by file numbers,

function params(. . ., fileNum)
. . .
save(sprintf('paramSet_%d.mat',fileNum), 'Param1', 'Param2')
end

Store all data in 1 mat file

If you are analyzing a population of files from a single dataset, it might be better to store the data in 1 file. I don't know how your data are organized but a structure array would be a simple and effective way of saving the data to file. Every time the function is called it would mere append the data in the mat file. You'd have to set a flag that identifies when a new mat file should be created or a filename input to identify which mat file to append.

Here's a demo by Stephen Cobeldick:

https://www.mathworks.com/matlabcentral/answers/322891-how-to-append-new-structure-array-element-in-existing-mat-file#answer_252931