MATLAB function within function handle output

[Carter]

Homework Statement

MATLAB

The funciton "rockdynamicstage" outputs a matrix 4 by x, where x is somthing around 300( varies).

The funciton "rockdynamicstage" is within the funciton handle "sim" with an input of gama0. (PayMass,Masstages,Massfrac,Thstage,IspStage,ChangeTstage) ar parameters that are set earlier in the code.

sim= @(gama0) rockdynamicstage(gama0,PayMass,Masstages,Massfrac,Thstage,IspStage,ChangeTstage);

Homework Equations

I need the "sim" to output the last element in the 4th row of the "rockdynamicstage". So that I get the last element in the 4th row in "rockdynamicstage" for a range of gama0s.

How would I output it.

The Attempt at a Solution

I tried doing
sim= @(gama0) rockdynamicstage(gama0,PayMass,Masstages,Massfrac,Thstage,IspStage,ChangeTstage)(4,end);

similar to when using a regular matrix

 

[donpacino]

x= @(gama0) rockdynamicstage(gama0,PayMass,Masstages,Massfrac,Thstage,IspStage,ChangeTstage);
sim=x(4,end);

Or you can change the rockdynamicstage function

 

[Carter]

x= @(gama0) rockdynamicstage(gama0,PayMass,Masstages,Massfrac,Thstage,IspStage,ChangeTstage);
sim=x(4,end);

Or you can change the rockdynamicstage function

But I need it to be a function handle. I need to be able to plug the function "sim" (that would ideally output the last element in the 4th row for a range of gama0s) into another function that finds the zero point.

So essentially I need the function handle to output a (x,2) array of the gama0s and the 4th row last elements for the rockdynamicstage.
output from the "sim" (or what you have as x) needs to be
[ gama01, rockdynamicstage(4,end); gama02, rockdynamicstage(4,end); gama03, rockdynamicstage(4,end);...so on]

 

[donpacino]

well if you want to make it very complicated then you need to change rockdynamicstage

 

[donpacino]

you can use a simple for loop to move between cases, calling sim at each gama value

 

[Carter]

This essentially is the outline but myrocketsim is rockdynamicstage. And the bisection method is used to find the zero

 

[donpacino]

There is a key difference between the code you presented and the code in step 2

 

[Carter]

There is a key difference between the code you presented and the code in step 2

What would that be?

 

[Carter]

What would that be?

Is it the "get()" part

 

[donpacino]

Yup

 

[donpacino]

I didn't realize get could extract elements of a matrix

 

[Carter]

I didn't realize get could extract elements of a matrix

that syntax "get()" doesn't work though

 

[donpacino]

get is designed to work with objects. My guess is you are supposed to define myrocket sim (or equivalent) as an object

 

[donpacino]

Do you know for sure that your professor requires this architecture. It could be done very easily by using a loop or modifying the function calls.

If not you need to modify the way your myrocketsim works