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Regular Member

extracting specific matrix

hai all

how to extract specific raws from phi matrix , i am trying to solve this by using this equation in phi x

8 REPLIES 8

Re: extracting specific matrix

It not clear what you'd like to achieve.

You should more clearly show what the result you are looking for should look like.

Your screenshot does not show the value of a, I guess its 3 (or less). So you sure should attach your worksheet - maybe not the full one but just a modified sheet to demonstrate what you are after.

Do you just want to extract the 3 non-zero rows? But your program suggest you are just interested to up to the 3a-1 column, not the full rows!?

If your goal is to extract just the non-zero rows you may try a combination of "match" and "trim".

Re: extracting specific matrix

I WANT TO EXTRACT THE DATA FOR SPECIFIC ROWS WHICH INCLUDE 0,2..N-1

FIRST MATRIX phi1 ==== EXTRACT THE DATA FOR ROWS WHICH INCLUDE 0,3..N-1

SECOND MATRIX  phi2==== EXTRACT THE DATA FOR ROWS WHICH INCLUDE 1,4..N-1

SECOND MATRIX  phi3==== EXTRACT THE DATA FOR ROWS WHICH INCLUDE 2,5..N-1

SINCE N=3*A , AND ALL CELL  NOT EQUAL ZERO

Re: extracting specific matrix

I am not sure waht you try to accomplish.  Use the submatrix function to extract a specific rows and columns

Re: extracting specific matrix

Please stop shouting, we can hear you loud and clear when you talk lowercase...

You should be able to program this in Prime.

Success!
Luc

Re: extracting specific matrix

ok , i don't about if i write by using big letters , this mean i am shouting

thanks for ur advice and helping me for solving this problem

Re: extracting specific matrix

The line in your program

phix <--  phi[i,j

Assigns a single element value to phix.  This program will always return a single number, not a row.

Re: extracting specific matrix

Hi,

You just need to add subscripts to phix in the program.   i/3 and j

Re: extracting specific matrix

@terryhendicott wrote:

Hi,

You just need to add subscripts to phix in the program.   i/3 and j

Better use trunc(i/3)  (and it should be Phi[i,j and not Phi[i[j).

What confuses me in the original screenshot provided by mostafaelhodiry is that his program returns 0 as value.

The value of a seems to be a=3 (he wrote n=3*a and n seems to be the number of rows in his matrix which is 9).

So the last value assigned to Phix is Phi[8,8 and this value would be returned. But Phi[8,8 is -0,185 and not 0 !?

So unless he is using a strange number format (Decimal with 0 as Decimal Precision) for the output  ... ???