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how can i subtract the elements in a coloumn ?

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farfar
farfar 2017-10-13
编辑： Jan 2017-10-13
hello
for example, I have : a=[380 0;381 1;382 2;383 3;383 4;383 5;384 6]
I want to go into first column and do this : (381-380), (382-381), (383-382),
how can i do this in a loop or other ways? Thanks for i=1:length(a) b=a(i,1) ????? end

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采纳的回答

John D'Errico
John D'Errico 2017-10-13
Start reading the tutorials.
diff(a(:,1))

更多回答（1 个）

Jan
Jan 2017-10-13
编辑：Jan 2017-10-13
Do you mean:
diff(a(:,1))
Alternatively with a loop:
n = size(a, 1) - 1;
b = zeros(1, n);
for k = 1:n
b(k) = a(k+1, 1) - a(k, 1);
end
Or without a loop:
b = a(2:end) - a(1:end - 1);

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