Matrix indexing - Picking columns

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bondpen
bondpen 2018-4-15
评论： Jan 2018-4-16
So I trying to give an output a matrix which contains every fifth column of input (A). Below is what my current script look like.
function B = Script30( A )
B = A(:,1:5:end);
end
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bondpen
bondpen 2018-4-15
编辑：bondpen 2018-4-15
I just in habit in this naming scheme lmao.
It giving me rows instead of columns.
Jan
Jan 2018-4-16
What give you rows? The shown code extracts columns.

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David Fletcher
David Fletcher 2018-4-15
Do you mean this instead of your 1:5:end?
5:5:end
If you explicitly also want column 1 the you could use [1 5:5:end]
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bondpen
bondpen 2018-4-15
Yea, that does the trick. What is ":," for? Does it tell command to choose columns?
David Fletcher
David Fletcher 2018-4-15
What the first colon? It means all rows and columns 5,10,15...etc. If you don't have the first colon - as you have found - it will compact all selected columns into one row. Well that was a bit harder than it should have been, I think I need a lie down.

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