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information about the number of times temperature changes from negative to positive

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Johannes Deelstra
Johannes Deelstra 2018-8-12
回答： Johannes Deelstra 2018-8-12
Hello
I have a time series with daily temperatures. The time series is starting with negative temperature. After some days the temperature is shifting from negative to positive and after some days back to negative. How can I get information about the number of times the temperature has changed from negative to positive.

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KALYAN ACHARJYA
KALYAN ACHARJYA 2018-8-12
编辑：KALYAN ACHARJYA 2018-8-12
*Consider the temperatures as a vector a
count=0;
for i=1:length(a)-1
if a(i)<0 && a(i+1)>0
count=count+1;
end
end
disp(count);

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Johannes Deelstra
Johannes Deelstra 2018-8-12
thanks very much

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