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# Call functions with names generated from strings

Asked by Kristian Jørgensen on 3 May 2013

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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Answer by Iman Ansari on 3 May 2013

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 on 3 May 2013

Thank you! That worked out perfectly!

Answer by the cyclist 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)
```