plot vector where negative data is circled

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Toke Søltoft
Toke Søltoft 2015-3-13
回答： Toke Søltoft 2015-3-13
If I e.g. have the following two vectors:
data = [1 2 3 -4 -5 6 -7 8 9 -10]
pos = [1 2 3 4 5 6 7 8 9 10]
How can I do
plot(abs(data),pos)
set(gca,'xscale','log');
where only the negative data is circled? Is that even possible without stepping through each data point?

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采纳的回答

Rick Rosson
Rick Rosson 2015-3-13
编辑：Rick Rosson 2015-3-13
isNeg = (data < 0);
plot(abs(data),pos)
hold on
plot(abs(data(isNeg)),pos(isNeg),'o')
set(gca,'xscale','log');

更多回答（1 个）

Toke Søltoft
Toke Søltoft 2015-3-13
thanks so much. Works like a charm.

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