Need to solve the equation to find ABC Values

Equation:

y = A (exp(Bx)-exp(-Cx))
x=[-0.5 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5];
y=[-2.2026 -0.2981 -0.0403 -0.0055 -0.0007];

to find A B C Values

Answer 1

[Stephan]

Hi,

x and y do not have the same length - if i assume, that y = -2.2026 belongs to x=-0.5 and so on you can determine the values for A, B and C as follows:

%x=[-0.5 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5]';
x=[-0.5 -0.4 -0.3 -0.2 -0.1]';
y=[-2.2026 -0.2981 -0.0403 -0.0055 -0.0007]';

fun = fittype(@(A, B, C, x)(A.*(exp(B.*x)-exp(-C.*x))));
[fitobject,gof,output] = fit(x, y, fun)
ABC = coeffvalues(res)

This assumes that you have the Curve Fitting Toolbox.

Best regards

Stephan

[Ajay Vignesh]

Thanks, man.

Answer 2

[Adinda]

Diketahui nilai dari beperapa titik sebagai berikut. Xi = 0.1, 0.2, 0.3, 0.4, 0.5 F(xi) = 0.43, 0.92, 1.47, 2.08, 2.75 Tentukan nilai turunan pertama dan kedua dari xi 0.1, 0.4, dan 0.5 menggunakan selisih maju dengan matlab