# Resolution of a system of nonlinear equations

Hey guys,.
Currently, I am trying to solve a set of nonlinear equations in LabView with the help of MathScript and MATLAB code. I am trying to create a code of work for hours, but I have not yet reached this goal.

System of equations:

x ^ 2 + y ^ 2 + z ^ 2 - R1 ^ 2 == 0
x ^ 2 + (y - Y0) ^ 2 + z ^ 2 - R2 ^ 2 == 0
(x X_0) ^ 2 + y ^ 2 + z ^ 2 - R3 ^ 2 == 0

R1, R2, R3, X 0, Y0 are known.

A possible solution in MATLAB (assuming that X 0 = Y0 = 100, R1 ^ 2 = R3 ^ 2 = 11000, R2 ^ 2 = 9000):

Create myfun.m with the contents:
function F = myfun (x);
F = [x (1) ^ 2 + (2) x ^ 2 + x (3) ^ 2-11000;]
x (1) ^ 2 + (x 2-100) ^ 2 + (3) x ^ 2-9000;
(x 1-100) ^ 2 + x (2) ^ 2 + (3) x ^ 2-11000];
end

The initial value for iteration:
x 0 = [50 50 50]

FIX:
fsolve (@myfun, x 0)

=> Works great!

Now, I tried all these stuff plug a MathScript node:

function F = myfun (x);
F = [x (1) ^ 2 + (2) x ^ 2 + x (3) ^ 2-11000;]
x (1) ^ 2 + (x 2-100) ^ 2 + (3) x ^ 2-9000;
(x 1-100) ^ 2 + x (2) ^ 2 + (3) x ^ 2-11000];

x 0 = [50 50 50];

Ground = fsolve (@myfun, x 0);

This is where the problem begins.

When I try to run the program, I get the following error message:

A function is defined in the present text. You must save and call
function with input values appropriate to run the function.

I can't really understand, what I did wrong and I would be very grateful if someone could help me.

Kind regards
fuchrist

Hello

MathScript does not support inline function defined by the user (UDF). What you need to do is

1. Define the UDF in a ".m" file. Give this file the same name as your UDF ".m".

2. Save the file ".m" MathScript search path. By default, the search path is the LabVIEW data folder.

3. Pass the name of the file ".m" as the first string input to the fsolve function in the MathScript node.

I enclose my .m file and snapshot of the MathScript node. The result I got is [50, 60, 70] which must be correct.

Tags: NI Products

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