2 replies to this topic

[ingquim09]

Hi! I'm a new user of CP330 and I'm not fed up with the programming language (well, I don't get on well with informatics in general).
I need to make a program able to calculate Colebrook's equation with entering one variable: the diameter or the Fanning factor.
I think I would made a program to calculate an equation, but how do I program to asking me for each variable?
I need it to iterate in problems,so sometimes I supose the diameter and calculate the f, and sometimes I supose the f and calculate D.
Could anybody help me, please?
Muy exam is aproaching and I'm getting axious.

[The_AFX_Master]

Hi..

You wont need to program that. Put the colebrook formula right into the solver, and solve for the friction factor F (is that colebrook formula that you're talking about?)

[ingquim09]

Hello!
First of all: thank you very much for reply so quickly. And yes, I'm talking about that formula.
I know I could do it with Solve, but I must do it many times. Also I need the program for the exam, because I think I'm not able to remember the formula and I must show in paper the results I obtained in every step.
I've tried copying the Solve in a spreedsheet, but it takes me so much time, cause I can't operate with the result, I have to copy the result in other cell and then operate. It's not good.
I am involved in making the program to calculate the formula, the problem is that I don't how to programm with 2 entries: I mean that I want the program to ask me "What do you want to obtain D or F?" then enter the variable (for example D) an obtain F (in that example) using Colebrook. And repeat the operation with many values.
Can you help me? I would be really gratefull.
Thanks you in advance.