append array of 1xn in mat file and as a result it should be look like kxn. k=3

I want to append array of 1xn which is having values of each iteration into mat file. eg if iteration=3 and data=1xn then i want that after iterations i will get mat file containing values like 3 rows and n columns. this mat file is inside a loop. I dont want to overwrite the values. in present code it is overwriting it.

thank you.

[Stephen23]

Note that save's -append option is very badly named: it should really be named -overwrite or something similar, because it does not "append" data to an existing variable in the .mat file, it actually completely overwrites any existing variable of the same name.

[N/A]

yes I know :)

Answer 1

[Stephen23]

You will have to do one of these:

1. on each iteration load the data, concatenate, then save the data.
2. use matfile.
3. collect all of the data into one array, then save it all at once after the loop.

I recommend the third option (because it is the neatest and most efficient). Use matfile for very large data sets.

[N/A]

Thank you very much. It can work but I have already solved my problem before your answer. and I too used the same way. And really thank you for this answer.

[Stephen23]

@suragini kulshrestha: my pleasure. Remember to accept my answer to show your thanks!

[N/A]

Really sorry. I assume that I did but unfortunately i did not accept your answer. forgive me for this.

[N/A]

Can you help me in one more problem. the problem is that I am storing data into data.mat file which is inside x.m file. so when I re-execute x.m file, the data.mat is not updated with new values. can you tell me the way how to resolve this problem. Thank you.

[Stephen23]

"the problem is that I am storing data into data.mat file which is inside x.m file. so when I re-execute x.m file, the data.mat is not updated with new values"

MATLAB .m files are text files for storing code. MATLAB .mat files are binary files for storing data. I don't see how you can have a .mat file "inside" a .m file. Please explain in a new comment, and upload your code by clicking the paperclip button.

[N/A]

And there is also another problem. gprofits is coming from another .m file. And inside for loop gprofits appending values but if I change the size of gprofits to 1xn and if profits is of size 1xk where k<n then due to column numbers are not same it gives an error. Help me to resolve these problems. Thank you

[N/A]

the problem has resolved. Thank you