How to simplify the given code snippet?

Question

Lulu 2011-11-2

Hello,

I need to simplify the following code. Perhaps 'reshape' function should be used, but in which way? Any ideas would be appreciated.

t=0:0.05:1;

% Dimensions of X and dx are the same

X=1:3; dx=0:0.1:0.3;

% How to write these 4 lines as 1?

colX1 = (X(1) + dx(1)*t)';

colX2 = (X(2) + dx(2)*t)';

colX3 = (X(3) + dx(3)*t)';

colX = [colX1; colX2; colX3];

Walter Roberson 2011-11-2

Note: your dx array might turn out as either 3 or 4 elements long, so be careful not to code anything that depends implicitly upon the length of dx.

Answer 1

Andrei Bobrov 2011-11-2

colX2 = reshape(bsxfun(@plus,X,bsxfun(@times,t',dx(1:3))),[],1);

or

colX2 = reshape(bsxfun(@plus,X,t'*dx(1:3)),[],1)