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hi, help please when I put this formula GEH2= sqrt(2*int64((flujo_sim2-FlujoReal2)^2)/int64(flujo_sim2+FlujoReal2)) in matlab, this returns me the following error: Check for missing argument or incorrect argument data type in call to function 'sqrt'.

why does this error give me?

Steven Lord
on 11 Dec 2020

The sqrt function is not defined for variables of the int64 data type. The square root of an integer value is not necessarily itself an integer value. If it were defined, what exactly would you expect x to be in the following code?

five = int64(5)

x = sqrt(five)

Steven Lord
on 11 Dec 2020

Can you show the output of the following command executed immediately before the line where you define FGEH?

whos flujo_sim2 FlujoReal2

I suspect one or both of those variables are int64. If so the results of all that arithmetic is again an int64 array and sqrt is not defined for int64 arrays.

Steven Lord
on 14 Dec 2020

The lines of code you posted doesn't tell me the class of the variables, which is the important information.

But I repeat my previous question. If you have an int64 number that is not a perfect square, would you be okay with getting an answer that when squared does not give you back the original number?

sqrtDouble = sqrt(5)

sqrtInt = int64(sqrt(5))

sqrtDouble.^2 - 5 % close to 0

sqrtInt.^2 - 5 % not really close to 0

Théophane Dimier
on 11 Dec 2020

David Hill
on 11 Dec 2020

Cannot take sqrt of int64 data type. Take sqrt of double then round and convert to int64.

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