How to import matrix into armadillo using binary files?

Question

I am trying to import a matrix generated in MATLAB into armadillo. For example, I have a matrix "A" which is 100x1 double. I used information from a previous question on stackoverflow to generate a binary file using MATLAB:

% Generate LocalX.bin
name = 'LocalX.bin';
[F,err] = fopen(name,'w');
if F<0,error(err);end
fwrite(F,LocalX, 'int32');
fclose(F);

and I imported it into armadillo using:

arma::Mat<int> LocalX;
std::string localx = "LocalX.bin";
LocalX.load(localx, arma::arma_binary);

The issue is, I have lost the matrix dimensions and I cannot perform any matrix manipulation on it using aramdillo.

How do I import the data into armadillo while maintaing the matrix dimensions?

Thank you.

(First time asking a question on stackoverflow)

Claes Rolen · Accepted Answer · 2021-08-24 01:43:00Z

0

If you know the dimensions (ROWS,COLS) beforehand you can add LocalX.reshape(ROWS,COLS) after you have loaded the matrix.

edited Aug 24, 2021 at 1:43

answered Aug 23, 2021 at 12:06

Claes Rolen

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2 Comments

mtall Over a year ago

According to the Armadillo docs, .set_size() does not guarantee to preserve data. Using .reshape() would be more appropriate.

Claes Rolen Over a year ago

Yes, you are right, missed that ... will edit

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