Perl and Math::MatrixReal

[dvdjimmy]

Hello to everybody,

i am currently using the Math::MatrixReal package to work with
matrices.

I have a matrix with 9 columns and about 10000 rows.

I now want to calculate the difference between the numbers in (1,1) and
(2,1) and write that in (1,10). Is something like that possible for all
my 10000 rows?

As far as i have seen now, i can only put a pointer to a column and
after that can work with this column. But how about working with the
original data.

Like in Matlab, to just use Matrix(1,10)=Matrix(1,1)-Matrix(2,1).

Hope someone out there can help me with this.

best regards,

Joachim

 

[Anno Siegel]

Hello to everybody,

i am currently using the Math::MatrixReal package to work with
matrices.

I have a matrix with 9 columns and about 10000 rows.

I now want to calculate the difference between the numbers in (1,1) and
(2,1) and write that in (1,10). Is something like that possible for all
my 10000 rows?

As far as i have seen now, i can only put a pointer to a column and
after that can work with this column.

What makes you think that?

But how about working with the
original data.

Like in Matlab, to just use Matrix(1,10)=Matrix(1,1)-Matrix(2,1).

Have you read the documentation of the module you're using? Look up the
methods ->element and ->assign.

Anno

 

[dvdjimmy]

Thank you for your answer.

You are absolutely right. i did not read the documentation very
carefully. The mentioned methods are exactly what i am looking for.

Thanks a lot.

Best regards,

Joachim