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Call functions with names generated from strings

Asked by Kristian Jørgensen

Kristian Jørgensen (view profile)

on 3 May 2013
Accepted Answer by Iman Ansari

Iman Ansari (view profile)

I am writing a piece of code for a 2 phase oil and water reservoir simulation. Assume I have a structure called fluid, in which there are several functions for parameteres for each phase, appropriately named:

fluid.muO @(p) %(oil viscosity as a function of pressure)
fluid.muW @(p) %(water viscosity as a function of pressure)

If I want to make a general function in which the phase is an input parameter, how do I use this string to call the function above? I tried:

phase = 'O'
eval = strcat('fluid.mu',phase)

Where to go from here I do not know, but I wish to use the variable phase to call fluid.muO and fluid.muW. Is it even possible?

Cheers

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2 Answers

Iman Ansari (view profile)

Answer by Iman Ansari

Iman Ansari (view profile)

on 3 May 2013
Accepted Answer

Hi.

fluid.muO=@(p) p.^2+1;
fluid.muW=@(p) cos(p)+2*sin(p);
phase = 'O';
name = strcat('fluid.mu',phase);%['fluid.mu',phase]
f=eval(name);
f([0 1 3])

1 Comment

Kristian Jørgensen

Kristian Jørgensen (view profile)

on 3 May 2013

Thank you! That worked out perfectly!

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the cyclist (view profile)

Answer by the cyclist

the cyclist (view profile)

on 3 May 2013

Here is one way:

fluid.muO = @(p) p;
fluid.muW = @(p) 2.*p;
phase = 'O';
eval(['F = @(p) fluid.mu',phase,'(p)'])
p = 1:10;
F(p)

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