plot help

Question

Nasir Qazi 2012-3-6

0
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 J(2,:) = bublept();
 O(1,:) = bublept();
 plot(rslt(2,:),rslt(1,:),'--  ks','MarkerFaceColor','r','LineSmoothing','on')
 hold all
 plot(J(2,:),O(1,:),'-- ks','MarkerFaceColor','r','LineSmoothing','on')
 xlim([100 280])
 ylim([0 8])
 xlabel('Temperature in K')
 ylabel('Pressure in MPa')
 title('Dew Point-curve')
 % I am trying to plot this , the first one has no problem the 2nd one does have a problem and unable to plot , please note J(2,:) & O(1,:) is located in another function file (bublept). could you tell me why it is not plotting?

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Answer 1

Walter Roberson 2012-3-6

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Unless your function bublept() has magic to know how many times it has been called, or unless it creates random values, then

J(2,:) = bublept();
O(1,:) = bublept();

would be assigning the same output to J(2,:) as to O(1,:) . Then when one was plotted against the other, you would get a straight line.

If you are thinking that the syntax

J(2,:) = bublept();

means that MATLAB should look inside the function bublept and find an assignment there to a variable named "J" and that it should copy that J value out to the calling function -- if that is what you are thinking, then functions do not work anything like that!