How can I split measured data in separate vectors, depending on sign value?

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Anna B.
Anna B. 2022-3-7
评论： Star Strider 2022-3-7
Hello! Is it possible to split measured data f.e.v= [1 2 3 4 5 4 3 2 1 2 3 4 5 4 3 2 1] in separate vectors, f.e. only the 'growing' values: v1=[1 2 3 4 5], v2=[1 2 3 4 5].
Maybe with a find(sign(diff(v))==1) ?
Thank you!

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采纳的回答

Star Strider
Star Strider 2022-3-7
Ran in:
One approach —
v= [1 2 3 4 5 4 3 2 1 2 3 4 5 4 3 2 1];
dv = gradient(v);
sel = v(dv>=0);
dsel = diff([1 find(diff([sel(1) sel])<0) numel(sel)+1]);
C = mat2cell(sel, size(sel,1), dsel)
C = 1×2 cell array
{[1 2 3 4 5]} {[1 2 3 4 5]}
v1 = C{1}
v1 = 1×5
1 2 3 4 5
v2 = C{2}
v2 = 1×5
1 2 3 4 5
.

更多回答（1 个）

Jan
Jan 2022-3-7
编辑：Jan 2022-3-7
Ran in:
Start with a simple loop approach:
v = [1 2 3 4 5 4 3 2 1 2 3 4 5 4 3 2 1];
dv = [false, diff(v) > 0, false];
ini = strfind(dv, [false, true]);
fin = strfind(dv, [true, false]);
C = cell(1, numel(ini));
for iC = 1:numel(ini)
C{iC} = v(ini(iC):fin(iC));
end
C
C = 1×2 cell array
{[1 2 3 4 5]} {[1 2 3 4 5]}

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