how to make a column vector with evenly spaced entries with different coefficients

I am trying to make the following 16x1 column vector

y = 3 %given, could be any value

ycoeff = [0;0;0;-4y;0;0;0;-3y;0;0;0;-2y;0;0;0-y]

If you could help me i would be very appreciative.

Thank you!

[madhan ravi]

doc colon

[Jos (10584)]

You forgot to add the multiplication symbol, and a semi-colon is missing before the last y ...

y = 3 %given, could be any value
ycoeff = [0;0;0;-4*y;0;0;0;-3*y;0;0;0;-2*y;0;0;0 ; -y]

Yet, somehow I feel that this is not the real question you want to have asnwers to ... :-D

Answer 1

[Andrei Bobrov]

k = -4:-1;
y = 3;

n = numel(k);
y = [zeros(n-1,n);y*k(:)'];
ycoeff = y(:); 

or

k = -4:-1;
y = 3;

n = numel(k);
ycoeff = zeros(n^2,1);
ycoeff(n:n:end) = k*y;

Answer 2

[Jos (10584)]

A simple one-liner:

y = 3 ;
k = 4 ;
ycoeff(k:k:(k*k), 1) = (-k:-1)*y

[madhan ravi]

Impacts Andrei's second solution on a larger scale ;-)

[alda alda]

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