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

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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 2018년 8월 12일
편집: KALYAN ACHARJYA 2018년 8월 12일
*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 2018년 8월 12일
thanks very much

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