Matlab script for a dynamical system [closed]

The code

 function hennonMap(a, b, xn, yn, upper)

 Xval = zeros(upper, 1);

 Yval = zeros(upper, 1);

 for i=1:upper

Xval(i) = xn;

Yval(i) = yn;

x  = yn + 1 - a*xn^2;

y  = b * xn;

xn = x;

yn = y;

end

end

Is giving me zeros, can anyone see why?

asked Dec 7 '18 at 7:20

user21312

closed as off-topic by copper.hat, Siong Thye Goh, Leucippus, user10354138, Lord Shark the Unknown Dec 8 '18 at 7:31

This question appears to be off-topic. The users who voted to close gave this specific reason:

"This question is not about mathematics, within the scope defined in the help center." – copper.hat, Siong Thye Goh, user10354138, Lord Shark the Unknown

If this question can be reworded to fit the rules in the help center, please edit the question.

$begingroup$
What are you hoping will happen?
$endgroup$
– copper.hat
Dec 7 '18 at 7:25

$begingroup$
What values do you give to a, b, xn, yn and upper?
$endgroup$
– Math Girl
Dec 7 '18 at 7:26

$begingroup$
@copper.hat generate some values corresponding to iterations of the map?
$endgroup$
– user21312
Dec 7 '18 at 7:31

$begingroup$
@MathFun123 I started with the standard $a=1.4$ $b=0.3$ and took the origin as inital value and $100$ iterations.
$endgroup$
– user21312
Dec 7 '18 at 7:32

$begingroup$
There are no outputs declared. What are you expecting the function to do? Print out some values at each iteration. Try something.
$endgroup$
– copper.hat
Dec 7 '18 at 7:34

|
show 8 more comments

The code

 function hennonMap(a, b, xn, yn, upper)

 Xval = zeros(upper, 1);

 Yval = zeros(upper, 1);

 for i=1:upper

Xval(i) = xn;

Yval(i) = yn;

x  = yn + 1 - a*xn^2;

y  = b * xn;

xn = x;

yn = y;

end

end

Is giving me zeros, can anyone see why?

asked Dec 7 '18 at 7:20

user21312

closed as off-topic by copper.hat, Siong Thye Goh, Leucippus, user10354138, Lord Shark the Unknown Dec 8 '18 at 7:31

This question appears to be off-topic. The users who voted to close gave this specific reason:

"This question is not about mathematics, within the scope defined in the help center." – copper.hat, Siong Thye Goh, user10354138, Lord Shark the Unknown

If this question can be reworded to fit the rules in the help center, please edit the question.

$begingroup$
What are you hoping will happen?
$endgroup$
– copper.hat
Dec 7 '18 at 7:25

$begingroup$
What values do you give to a, b, xn, yn and upper?
$endgroup$
– Math Girl
Dec 7 '18 at 7:26

$begingroup$
@copper.hat generate some values corresponding to iterations of the map?
$endgroup$
– user21312
Dec 7 '18 at 7:31

$begingroup$
@MathFun123 I started with the standard $a=1.4$ $b=0.3$ and took the origin as inital value and $100$ iterations.
$endgroup$
– user21312
Dec 7 '18 at 7:32

$begingroup$
There are no outputs declared. What are you expecting the function to do? Print out some values at each iteration. Try something.
$endgroup$
– copper.hat
Dec 7 '18 at 7:34

|
show 8 more comments

The code

 function hennonMap(a, b, xn, yn, upper)

 Xval = zeros(upper, 1);

 Yval = zeros(upper, 1);

 for i=1:upper

Xval(i) = xn;

Yval(i) = yn;

x  = yn + 1 - a*xn^2;

y  = b * xn;

xn = x;

yn = y;

end

end

Is giving me zeros, can anyone see why?

asked Dec 7 '18 at 7:20

user21312

The code

 function hennonMap(a, b, xn, yn, upper)

 Xval = zeros(upper, 1);

 Yval = zeros(upper, 1);

 for i=1:upper

Xval(i) = xn;

Yval(i) = yn;

x  = yn + 1 - a*xn^2;

y  = b * xn;

xn = x;

yn = y;

end

end

Is giving me zeros, can anyone see why?

matlab

asked Dec 7 '18 at 7:20

user21312

asked Dec 7 '18 at 7:20

user21312

asked Dec 7 '18 at 7:20

user21312

asked Dec 7 '18 at 7:20

user21312

asked Dec 7 '18 at 7:20

user21312

closed as off-topic by copper.hat, Siong Thye Goh, Leucippus, user10354138, Lord Shark the Unknown Dec 8 '18 at 7:31

This question appears to be off-topic. The users who voted to close gave this specific reason:

"This question is not about mathematics, within the scope defined in the help center." – copper.hat, Siong Thye Goh, user10354138, Lord Shark the Unknown

If this question can be reworded to fit the rules in the help center, please edit the question.

closed as off-topic by copper.hat, Siong Thye Goh, Leucippus, user10354138, Lord Shark the Unknown Dec 8 '18 at 7:31

This question appears to be off-topic. The users who voted to close gave this specific reason:

"This question is not about mathematics, within the scope defined in the help center." – copper.hat, Siong Thye Goh, user10354138, Lord Shark the Unknown

If this question can be reworded to fit the rules in the help center, please edit the question.

$begingroup$
What are you hoping will happen?
$endgroup$
– copper.hat
Dec 7 '18 at 7:25

$begingroup$
What values do you give to a, b, xn, yn and upper?
$endgroup$
– Math Girl
Dec 7 '18 at 7:26

$begingroup$
@copper.hat generate some values corresponding to iterations of the map?
$endgroup$
– user21312
Dec 7 '18 at 7:31

$begingroup$
@MathFun123 I started with the standard $a=1.4$ $b=0.3$ and took the origin as inital value and $100$ iterations.
$endgroup$
– user21312
Dec 7 '18 at 7:32

$begingroup$
There are no outputs declared. What are you expecting the function to do? Print out some values at each iteration. Try something.
$endgroup$
– copper.hat
Dec 7 '18 at 7:34

|
show 8 more comments

$begingroup$
What are you hoping will happen?
$endgroup$
– copper.hat
Dec 7 '18 at 7:25

$begingroup$
What values do you give to a, b, xn, yn and upper?
$endgroup$
– Math Girl
Dec 7 '18 at 7:26

$begingroup$
@copper.hat generate some values corresponding to iterations of the map?
$endgroup$
– user21312
Dec 7 '18 at 7:31

$begingroup$
@MathFun123 I started with the standard $a=1.4$ $b=0.3$ and took the origin as inital value and $100$ iterations.
$endgroup$
– user21312
Dec 7 '18 at 7:32

$begingroup$
There are no outputs declared. What are you expecting the function to do? Print out some values at each iteration. Try something.
$endgroup$
– copper.hat
Dec 7 '18 at 7:34

What are you hoping will happen?

– copper.hat
Dec 7 '18 at 7:25

What values do you give to a, b, xn, yn and upper?

– Math Girl
Dec 7 '18 at 7:26

@copper.hat generate some values corresponding to iterations of the map?

– user21312
Dec 7 '18 at 7:31

@MathFun123 I started with the standard $a=1.4$ $b=0.3$ and took the origin as inital value and $100$ iterations.

– user21312
Dec 7 '18 at 7:32

There are no outputs declared. What are you expecting the function to do? Print out some values at each iteration. Try something.

– copper.hat
Dec 7 '18 at 7:34

|
show 8 more comments

1 Answer
1

active

oldest

votes

Try this:

function [Xval,Yval] = hennonMap(a, b, xn, yn, upper)

Xval = zeros(upper, 1);

Yval = zeros(upper, 1);

for i=1:upper

Xval(i) = xn;

Yval(i) = yn;

x  = yn + 1 - a*xn^2;

y  = b * xn;

xn = x;

yn = y;

end

end

answered Dec 7 '18 at 7:42

Math Girl

631318

$begingroup$
thanks, I just skipped the function part instead then I got it to work. But now I understand the problem with the other one. Ill try this before taking this answer.
$endgroup$
– user21312
Dec 7 '18 at 7:44

$begingroup$
I do find it kind of odd that "Xval" returns zeros even if it didnt get "saved", if it didnt get saved it should just say "error" when calling it.
$endgroup$
– user21312
Dec 7 '18 at 7:47

$begingroup$
Yes I also don't know why, but does it work now?
$endgroup$
– Math Girl
Dec 7 '18 at 8:14

$begingroup$
yes it works fine now
$endgroup$
– user21312
Dec 7 '18 at 19:34

add a comment |

1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

Try this:

function [Xval,Yval] = hennonMap(a, b, xn, yn, upper)

Xval = zeros(upper, 1);

Yval = zeros(upper, 1);

for i=1:upper

Xval(i) = xn;

Yval(i) = yn;

x  = yn + 1 - a*xn^2;

y  = b * xn;

xn = x;

yn = y;

end

end

answered Dec 7 '18 at 7:42

Math Girl

631318

$begingroup$
thanks, I just skipped the function part instead then I got it to work. But now I understand the problem with the other one. Ill try this before taking this answer.
$endgroup$
– user21312
Dec 7 '18 at 7:44

$begingroup$
I do find it kind of odd that "Xval" returns zeros even if it didnt get "saved", if it didnt get saved it should just say "error" when calling it.
$endgroup$
– user21312
Dec 7 '18 at 7:47

$begingroup$
Yes I also don't know why, but does it work now?
$endgroup$
– Math Girl
Dec 7 '18 at 8:14

$begingroup$
yes it works fine now
$endgroup$
– user21312
Dec 7 '18 at 19:34

add a comment |

Try this:

function [Xval,Yval] = hennonMap(a, b, xn, yn, upper)

Xval = zeros(upper, 1);

Yval = zeros(upper, 1);

for i=1:upper

Xval(i) = xn;

Yval(i) = yn;

x  = yn + 1 - a*xn^2;

y  = b * xn;

xn = x;

yn = y;

end

end

answered Dec 7 '18 at 7:42

Math Girl

631318

$begingroup$
thanks, I just skipped the function part instead then I got it to work. But now I understand the problem with the other one. Ill try this before taking this answer.
$endgroup$
– user21312
Dec 7 '18 at 7:44

$begingroup$
I do find it kind of odd that "Xval" returns zeros even if it didnt get "saved", if it didnt get saved it should just say "error" when calling it.
$endgroup$
– user21312
Dec 7 '18 at 7:47

$begingroup$
Yes I also don't know why, but does it work now?
$endgroup$
– Math Girl
Dec 7 '18 at 8:14

$begingroup$
yes it works fine now
$endgroup$
– user21312
Dec 7 '18 at 19:34

add a comment |

Try this:

function [Xval,Yval] = hennonMap(a, b, xn, yn, upper)

Xval = zeros(upper, 1);

Yval = zeros(upper, 1);

for i=1:upper

Xval(i) = xn;

Yval(i) = yn;

x  = yn + 1 - a*xn^2;

y  = b * xn;

xn = x;

yn = y;

end

end

answered Dec 7 '18 at 7:42

Math Girl

631318

Try this:

function [Xval,Yval] = hennonMap(a, b, xn, yn, upper)

Xval = zeros(upper, 1);

Yval = zeros(upper, 1);

for i=1:upper

Xval(i) = xn;

Yval(i) = yn;

x  = yn + 1 - a*xn^2;

y  = b * xn;

xn = x;

yn = y;

end

end

answered Dec 7 '18 at 7:42

Math Girl

631318

answered Dec 7 '18 at 7:42

Math Girl

631318

answered Dec 7 '18 at 7:42

Math Girl

631318

answered Dec 7 '18 at 7:42

Math Girl

631318

$begingroup$
thanks, I just skipped the function part instead then I got it to work. But now I understand the problem with the other one. Ill try this before taking this answer.
$endgroup$
– user21312
Dec 7 '18 at 7:44

$begingroup$
I do find it kind of odd that "Xval" returns zeros even if it didnt get "saved", if it didnt get saved it should just say "error" when calling it.
$endgroup$
– user21312
Dec 7 '18 at 7:47

$begingroup$
Yes I also don't know why, but does it work now?
$endgroup$
– Math Girl
Dec 7 '18 at 8:14

$begingroup$
yes it works fine now
$endgroup$
– user21312
Dec 7 '18 at 19:34

add a comment |

$begingroup$
thanks, I just skipped the function part instead then I got it to work. But now I understand the problem with the other one. Ill try this before taking this answer.
$endgroup$
– user21312
Dec 7 '18 at 7:44

$begingroup$
I do find it kind of odd that "Xval" returns zeros even if it didnt get "saved", if it didnt get saved it should just say "error" when calling it.
$endgroup$
– user21312
Dec 7 '18 at 7:47

$begingroup$
Yes I also don't know why, but does it work now?
$endgroup$
– Math Girl
Dec 7 '18 at 8:14

$begingroup$
yes it works fine now
$endgroup$
– user21312
Dec 7 '18 at 19:34

thanks, I just skipped the function part instead then I got it to work. But now I understand the problem with the other one. Ill try this before taking this answer.

– user21312
Dec 7 '18 at 7:44

I do find it kind of odd that "Xval" returns zeros even if it didnt get "saved", if it didnt get saved it should just say "error" when calling it.

– user21312
Dec 7 '18 at 7:47

Yes I also don't know why, but does it work now?

– Math Girl
Dec 7 '18 at 8:14

yes it works fine now

– user21312
Dec 7 '18 at 19:34

add a comment |

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