how to correct ''Function definitions are not permitted in this context.''

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Function definitions are not permitted in this context.
a = 0.5;
B = 0.6;
k = 1;
[t, x] = ode45(@Ray, [0 30],[ 0 0.1], [], a, B, k);
plot(x(:,1), x(:,2), 'k-')
function d = Ray(t, y, a, B, k)
d=[y(2);-k*y(1)+a*y(2)-B*y(2^3];

Accepted Answer

Image Analyst
Image Analyst on 30 Sep 2014
You can't have a script and a function inside the same m-file. You can have two functions and they don't need to be nested . For example if your m-file is called test.m, you could have test() and Ray() both inside test.m like this:
function test()
a = 0.5;
B = 0.6;
k = 1;
[t, x] = ode45(@Ray, [0 30],[ 0 0.1], [], a, B, k);
plot(x(:,1), x(:,2), 'k-')
function d = Ray(t, y, a, B, k)
d=[y(2);-k*y(1)+a*y(2)-B*y(2^3];
  3 Comments
Image Analyst
Image Analyst on 30 Sep 2014
I believe they're not nested. Even if you put an end at the end of each one they're still not nested. Ray would not be nested inside test unless the end for test() occurred after Ray(), because in that case Ray would lie completely inside (nested) of test.
John D'Errico
John D'Errico on 30 Sep 2014
Edited: John D'Errico on 30 Sep 2014
Star - This is NOT a nested function. It is a sub-function, a different animal. A nested function can see the workspace of the parent function. A sub-function cannot, although it resides in the same file. There is a difference, and it is essentially controlled by proper placement of appropriate end statements as Image has stated.

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More Answers (1)

sarvesh aundhkar
sarvesh aundhkar on 22 Nov 2017
function test() a = 0.5; B = 0.6; k = 1; [t, x] = ode45(@Ray, [0 30],[ 0 0.1], [], a, B, k); plot(x(:,1), x(:,2), 'k-') function d = Ray(t, y, a, B, k) d=[y(2);-k*y(1)+a*y(2)-B*y(2^3];

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