How to efficiently create a vector?

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balandong 2017-6-23

评论： Star Strider 2017-6-23

I want create a matrix such that

A matrix mat_B = [ 1 2 3 4 5; 6 7 8 9 10; 11 12 13 14 15; 16 17 18 19 20].

Is there any other code that more efficient than the code I make below?

for i = 1:5 if i ==1 a (i,:)=1:4; else a (i,:) = (a (i-1,:))+4; end end

Star Strider 2017-6-23

I would use the reshape function to avoid the explicit loops:

v = 1:20;
mat_B = reshape(v, 5, [])';

balandong 2017-6-23

Yes, I agree with you, this indeed a more compact solution. Thanks

Star Strider 2017-6-23

My pleasure.

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