Substitute an array of number for a symbolic variable
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David Arnold
el 1 de Nov. de 2012
Comentada: Walter Roberson
el 12 de Jul. de 2019
Hi,
I have:
syms x y
f=x^3+y^3+3x^2+2y^2+9
fx=diff(f,x)
now, I'd like to substitute these two vectors of x and y values into the expression fx.
x=[1,2,3,4,5]
y=[6,7,8,9,10]
How do I do that with the subs command? If I can't do that with the subs command, what do you recommend?
David.
1 comentario
Star Strider
el 1 de Nov. de 2012
Editada: Star Strider
el 1 de Nov. de 2012
Question: Do you want a matrix with the function evaluation of fx for each value of (x,y) as an individual element?
What version of MATLAB do you have? Beginning with 2012a, symbolic functions are possible.
Respuesta aceptada
Walter Roberson
el 1 de Nov. de 2012
subs(fx, {x, y}, {[1,2,4,5,6}, [6,7,8,9,10]})
This syntax is documented relatively far down in the examples.
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Azzi Abdelmalek
el 1 de Nov. de 2012
syms x y
f=x^3+y^3+3*x^2+2*y^2+9
fx=diff(f,x)
x=[1,2,3,4,5]
y=[6,7,8,9,10]
eval(f)
eval(fx)
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