1-Visitor

Question

Root function help

Forum|Forum|15 years ago
December 9, 2010
2 replies
3706 views

Hello,

I tried to solve the darcy friction factor formula symbolically, but mathcad couldn't do it. So now I am trying to solve it using the root function. However, the answer that I get is the same as my guess all the time. What am I doing wrong? I have attached the worksheet. The root problem is at the very bottom.

Thanks

D

1_slurrycode-xmcd.zip

Other

1-Visitor

I'm not sure your equations are correct.

Firstly, you define the function X(f) with a local definition and secondly you define X(f) again using the boolean equal operator.

Do you know the answer? Which equation is the root function meant to be applied to?

Mike

Author

1-Visitor

you are right I goofed. I got it to work.

D

19-Tanzanite

You have X(f) defined as 1/sqrt(f), and then func(f) defined as X(f)-1/sqrt(f), so func(f) is zero for all values of f.

Your boolean version of the function X(f) below is not a fuction defintion, and has a unit mismatch.