MATLAB: Matlab Integration function

polynomial

Good morning everyone

I would like to integrate the following function from 0 until 0.018. Can somebody give me a suggestion about the matlab code for this task ? I have tried different options (quad option) but MATLAB gives me a error.

y=8.3151e+006*x^3-7.9844e+005*x^2+20672*x-0.586

Thanks

Sergio

Best Answer

f=@(x)8.3151e+006*x.^3-7.9844e+005*x.^2+20672*x-0.586
result = quad(f,0,.018)

p = [8315100 -798440  20672 -0.586] % coefficients of polynom
result = diff(polyval(polyint(p),[0 .018]))

Related Solutions

MATLAB: Could anyone help me how to plot the graph for more than one variable.

x=[0.1 1 2 3 4]
y=[0.05 0.06 0.06 0.06 0.06 ]
z=[0.14 0.18 0.18 0.18 0.18]
plot(x,y,'-*');
hold on;
plot(x,z,'-^')

MATLAB: Unique quad element list

I answer my own question. This should work:

[t_quad,~,~]=unique(t_quad,'rows');
[p_quad,~,b]=unique(p_quad,'rows');
t_quad(:)=b(t_quad(:));
[p_unique,~,~]=unique(p_quad(t_quad(:),:),'rows');
[~,c]=ismember(p_quad,p_unique,'rows');
p_quad=p_unique;
t_quad(:)=c(t_quad(:));

Thanks anyway!

Best Answer

Related Solutions

MATLAB: Could anyone help me how to plot the graph for more than one variable.

MATLAB: Unique quad element list

Related Question