How do I create such matrix ? (please look at the thread for further details)

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Derick Wong
Derick Wong 2013-12-24
回答： Image Analyst 2013-12-24
Hi,
Let say I have a matrix of m column. eg[X1 X2 X3 X4 ... Xm].
How do I create a matrix that becomes [X1 X2-X1 X3-X2 X4-X3 ... Xm-Xm-1]for m columns ?
And if I have n rows and m column, how do I create such matrix?

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回答（2 个）

Azzi Abdelmalek
Azzi Abdelmalek 2013-12-24
编辑：Azzi Abdelmalek 2013-12-24
v=[10 50 200 1000]
out=[v(1) diff(v)]
Image Analyst
Image Analyst 2013-12-24
Alternative ways that could be extended for subtracting more than 2 columns, but Azzi's method is probably better/simpler/easier to understand for subtracting just 2 columns.
outc = [v(1), conv(v, [1,-1], 'valid')] % 1D
outc2 = [v(:,1), conv2(v, [1,-1], 'valid')] % 2D

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