How to efficiently create a vector?

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balandong
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

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Star Strider
Star Strider 2017-6-23
I would use the reshape function to avoid the explicit loops:
v = 1:20;
mat_B = reshape(v, 5, [])';

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