Incorrect use of '=' operator. Assign a value to a variable using '=' and compare values for equality using '=='.

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Naveen Krish
Naveen Krish 2022-3-15
评论： Walter Roberson 2022-3-15
D=0.1;
U=1;
K= 1*10^-6;
ci=3;
co=2;
L=1;
y(1) =C;
y(2) = dc/dx;
y(2)'=dc^2/dx^2;
function dcdx = bvpfcn(c,x) % euation to solve
dcdx= y(2)(U*y(2)+K*y(1))/D];
end
function res =bcfcn(ya,yb) % boundary conditions
res = [ya(1)
yb(1)-L];
end
function g = guess(x) %initial guess for y and y'
g = [0 1];
end
plot(sol.C, Sol.x,'-0')
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Walter Roberson
Walter Roberson 2022-3-15
Ran in:
@Naveen Krish
No. In MATLAB, ' is an operator means "complex transpose". It cannot be part of the name of a variable.
x = [1+2i 3-4i]
x =
1.0000 + 2.0000i 3.0000 - 4.0000i
x'
ans =
1.0000 - 2.0000i 3.0000 + 4.0000i
When you have numeric data, you can do numeric estimation of the derivative using gradient()
If you have the Symbolic toolbox, then you can use diff() to request symbolic differentiation
syms x
f = tan(1-x^2)
f = 
f__prime = simplify(expand(diff(f, x)))
f__prime = 
f__primeprime = simplify(diff(f__prime,x))
f__primeprime = 

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