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POProblem finding standard deviation and population variance correctly using Fortran
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5547475
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2011-04-05T05:11:42.720
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2017-06-13T06:42:36.947
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2011-04-05T05:44:03.890
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<p>I couldn't find much when I searched for standard deviations and population variances on fortran 95. So I'm wondering if someone could help me? Thanks for your time.</p> <p>Here is what I did, it compiled fine but it turned out giving wrong values: </p> <pre><code> SUBROUTINE ComputeStats(num, sum, avg, variance, sdv) REAL, INTENT(IN):: num(10) REAL, INTENT(OUT):: sum REAL, INTENT(OUT):: avg, variance, sdv DO i=1, 10 sum=sum+num(i) END DO avg=sum/10 DO i=1, 10 variance=(((num(i)-avg)**2.0)/10) variance=variance+i sdv=variance**0.5 END DO END SUBROUTINE </code></pre>
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<statistics><fortran><standards><variance><deviation>
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Problem finding standard deviation and population variance correctly using Fortran
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1. COAs an aside, the first loop can be replaced with the SUM intrinsic, e.g. "mysum = sum(num)" (calling the variable mysum in order to avoid confusing wrt. using the same name as the intrinsic function).
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2. COOn the first run through the first do-loop, the variable sum is still undefined. It is therefore incorrect to use it on the right hand side of an assignment statement. Put `sum = 0` before the start of the loop. (Many compilers initialize memory to zero, but the standard doesn't guarantee that, so don't rely on it.)
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