MATLAB: Calculating a number in matlab

calculatingnumbers in matlab

Hello, I am trying to simply calculate a number in matlab, and for some reason im getting this error:

EDU>> x=-((3+sqrt(9-(4*1*(-8^-18)))/2)
 x=-((3+sqrt(9-(4*1*(-8^-18)))/2)
                                |
Error: Expression or statement is incorrect--possibly unbalanced (, {, or [.

anyone know whats going on here?

Best Answer

this would be correct syntax x=-(3+sqrt(9-(4*1*((-8)^-18)))/2) try it

Related Solutions

MATLAB: Calculating average

Here is some code that might do the job. I am assuming that your image is truecolor, so the data have dimensions M x N x 3 for some M and N, and the colors are 24-bit, so the data type in R is uint8. If your images are different, you'll have to adjust the code:

n = length(dirlist);
R =  imread([pathname, dirlist(1).name]);
RR = zeros([size(Rav) n]);
% Put the images into an M x N x 3 x 60 array
for m2 = 2:n
  RR(:,:,:,m2) = imread([pathname, dirlist(m2).name]);
end
Rav = mean(RR,4); % average along the 4th dimension of the data
RR = bsxfun(@minus,RR,Rav); % subtract the average from each image

You can examine the kth image with

R = RR(:,:,:,k);
image(R)

MATLAB: Solve a system of equations

function main
x0=zeros(8,1);
sol=fminsearch(@(x)fun(x(1),x(2),x(3),x(4),x(5),x(6),x(7),x(8)),x0)
sol=fminsearch(@(x)fun(x(1),x(2),x(3),x(4),x(5),x(6),x(7),x(8)),sol)
sol=fminsearch(@(x)fun(x(1),x(2),x(3),x(4),x(5),x(6),x(7),x(8)),sol)
sol=fminsearch(@(x)fun(x(1),x(2),x(3),x(4),x(5),x(6),x(7),x(8)),sol)
res=fun(sol(1),sol(2),sol(3),sol(4),sol(5),sol(6),sol(7),sol(8))
end
function res = fun(a1,a2,a3,a4,R1,R2,R3,R4)
l1=50;
l2=50;
l3=50; 
Fc1=30; 
Fc2=50; 
Fc3=100; 
a=25;
b=25;
c=25;
d=25;
e=25;
f=25;
v1=0;
v2=0;
v3=0;
v4=0;
m1=0;
m2=0;
m3=0;
m4=0;
A=[12/l1^2, 6/l1^2, -12/l1^3, 6/l1^2, 0, 0, 0, 0;...
    6/l1^2, 4/l1^2, -6/l1^2, 4/l1^2, 0, 0, 0, 0; ...
    -12/l1^3, -6/l1^2, 12/l1^3+12/l2^3, -6/l1^2+6/l2^2, -12/l2^3, 6/l2^2, 0, 0; ...
    6/l1^2, 2/l1 -6/l1^2+6/l2^2, 4/l1+4/l2, -6/l2^2, 4/l2, 0, 0; ...
    0, 0, -12/l2^3, -6/l2^2, 12/l2^3+12/l3^3, -6/l2^2+6/l3^2, -12/l3^3, 6/l3^2; ...
    0, 0, 6/l2^2, 2/l2, -6/l2^2+6/l3^2, 4/l2+4/l3, -6/l3^2, 4/l3; ...
    0, 0, 0, 0, -12/l3^3, -6/l3^2, 12/l3^3, -6/l3^2; ...
    0, 0, 0, 0, 6/l3^2, 2/l3, -6/l3^2, 4/l3];
x=[v1, a1, v2, a2, v3, a3, v4, a4]';
s=[R1, m1, R2, m2, R3, m3, R4, m4]';
F=[(l1+2*a^3-3*l1*a^2)*Fc1/l1^3, (a^3+l1^2*a-2*l1*a)*Fc1/l1^3, ...
    (2*a^3-3*l1*a^2)*Fc1/l1^2+(l2+2*c^3-3*l2*c^2)*Fc2/l2^3, (a^3-l1*a^2)*Fc1/l1^2+(c^3+l2^2*c-2*l2*c)*Fc2/l2^2, ...
    (2*c^3-3*l2*c^2)*Fc2/l2^2+(l3+2*e^3-3*l3*e)*Fc3/l3^3, (c^3-l2*c^2)*Fc2/l2^2+(e^3+l3*e-2*l3*e)*Fc3/l3^2, ...
    (2*e^3-3*l3*e^2)*Fc3/l3^3, (e^3-l3^2)*Fc3/l3^2]';
res=sum((A*x-s-F).^2);
end

Best Answer

Related Solutions

MATLAB: Calculating average

MATLAB: Solve a system of equations

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