 # Matrix assignment

I am trying to run a while loop which will give me a new Kx1 vector each time. Suppose the vector is stored in variable `a`.I'm trying to create a matrix which will have this vector as column entities, the number of columns being equal to the number of loops.

``````fi={};

do while col<1000;
........

do while row<50;
fi[row,col]= a[row];
row=row+1;
endo;

col=col+1;
endo;``````

The fi matrix has only elements in the first column(that from the execution of final loop values).How can I get a matrix with columns containing the Kx1 vectors?

0

accepted

Here is a simple example program that will create a new vector `a` on each loop iteration and assign it to a column of `fi`. Each `a` is just a vector of integers all equal to the loop iteration number to make the output easy to understand

``````nrows = 10;
ncols = 4;

//Pre-allocate size of final matrix
fi = zeros(nrows, ncols);

//Loop over each column
for i(1, ncols, 1);

//Get next 'a' vector
a = getvec(nrows, i);

//Assign the contents of 'a'
//to the ith column of 'fi'
fi[.,i] = a;
endfor;

//Return a vector of integers
//to simulate a process of creating a vector
proc (1) = getvec(nrows, i);
retp(ones(nrows,1) .* i);
endp;`````` aptech

1,728

0
accepted

Here is a simple example program that will create a new vector `a` on each loop iteration and assign it to a column of `fi`. Each `a` is just a vector of integers all equal to the loop iteration number to make the output easy to understand

``````nrows = 10;
ncols = 4;

//Pre-allocate size of final matrix
fi = zeros(nrows, ncols);

//Loop over each column
for i(1, ncols, 1);

//Get next 'a' vector
a = getvec(nrows, i);

//Assign the contents of 'a'
//to the ith column of 'fi'
fi[.,i] = a;
endfor;

//Return a vector of integers
//to simulate a process of creating a vector
proc (1) = getvec(nrows, i);
retp(ones(nrows,1) .* i);
endp;`````` aptech
1,728

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