Substitute an array of number for a symbolic variable
13 次查看(过去 30 天)
显示 更早的评论
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 个评论
Star Strider
2012-11-1
编辑:Star Strider
2012-11-1
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.
采纳的回答
Walter Roberson
2012-11-1
subs(fx, {x, y}, {[1,2,4,5,6}, [6,7,8,9,10]})
This syntax is documented relatively far down in the examples.
更多回答(1 个)
Azzi Abdelmalek
2012-11-1
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)
0 个评论
另请参阅
产品
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!