SQRT in stm32f4 ?

bmwael1 · ‎2013-06-03

Posted on June 03, 2013 at 15:06

Hello

I want to use sqrt (

square root

) function to calculate sqrt (x^2 + y^2)

but i haven't math.h in my root this is the error

undefined reference to `sqrt'

collect2: ld returned 1 exit status

how can i fix it please or are there an approximation of this function.

Thanks 🙂

#lmgtfy

Tesla DeLorean · ‎2013-06-03

Posted on June 03, 2013 at 15:34

Include files don't pull in code, you must link against a suitable C math library. Consider using the ''-lm'' option for the compiler, which should pull in libm

Also consider sqrtf(), this at least might have some chance of using the FPU.

http://www.embedded.com/electronics-blogs/programmer-s-toolbox/4219659/Integer-Square-Roots

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