undefine function or variable

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marwa marwan
marwa marwan on 24 Jun 2015
Edited: Walter Roberson on 25 Jun 2015
ihave a vector positionsa with 20 elements and a variable Alpha_posa and a want to take th ith elemet but this error will kill me
??? Undefined function or method 'Positionsa'
for input arguments of type 'double'.
Error in ==> Untitled at 69
Alpha_posa=Positionsa(i);

Accepted Answer

Brendan Hamm
Brendan Hamm on 24 Jun 2015
Judging by what you have written and the error given it seems that your issue is with the capitalization. MATLAB is case sensitive and therefore you would want:
Alpha_posa = positionsa(i);
  2 Comments
Brendan Hamm
Brendan Hamm on 25 Jun 2015
I would like to reiterate you original statement. You say that you have a 20-by-1 vector positionsa.
Your error states:
??? Undefined function or method ' Positionsa ' for input arguments of type 'double'.
Error in ==> Untitled at 69 Alpha_posa=Positionsa(i);
Given this error, it is clear the command you typed is:
Alpha_posa=Positionsa(i); % Error!
MATLAB is case sensitive, so you need to type:
Alpha_posa = positionsa(i); % This should work if I is also defined
So the following set of commands will work:
positionsa = rand(20,1); % Random vector with 20 elements
i = 5; % An variable for indexing
Alpha_posa = positionsa(i) % Extract the 5th element.
marwa marwan
marwa marwan on 25 Jun 2015
you are so right...samll error can confuse alot thank you for your time

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