Symbolic package: Difference between revisions

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580 bytes added ,  17 February 2017
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  plot(x1,y)
  plot(x1,y)
  grid minor on  
  grid minor on  
* '''Demo of how to suppress a warning about converting from floating point numbers to symbolic numbers.
## Demo of how to use a number (which was calculated in an octave
## variable) in a symbolic calculation, without getting a warning.
## use octave to calculate some number:
a=pi/2
## now do some work with the symbolic pkg
syms x
    f = x * cos(x)
    df = diff(f)
## Next get the number into a symbolic variable 
## convert to string first 
    aa=mat2str(a)
## and now to a symbolic variable.   
    ww=sym(aa)
## and now use it 
    vpa(subs(df, x, ww), 28)
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