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How to find the value of a function for different input?

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Sumit dash
Sumit dash 2020-2-5
编辑： KSSV 2020-2-5
hello !
lets say i have a function f(x)=x^2+3*x;
i want to find the function vaslues from x=1 to x=20.
how to write the code for the above ?
syms x
f=x^2+3*x;
for i=1:20
f(i);
end
above code is showing error. please provide your input !

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回答（1 个）

KSSV
KSSV 2020-2-5
编辑：KSSV 2020-2-5
Multiple methods:
Method # 1 Anonymous functions
f = @(x) x.^2+3*x ;
x = linspace(1,20,100) ;
y = f(x) ;
plot(x,y)
Method # 2 Using arrays
x = linspace(1,20,100) ;
y = x.^2+3*x ;
plot(x,y)
Method # 3 using syms
syms x
f(x) = x^2+3*x ;
double(f(3))

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