f(x)=3x^3-5x^2+3x-7=0

%fx=3x^3-5x^2+5x-7
%fdx=9x^2-10x+3
x(1);
kk(1)=1;
for k=1:100;
    fx=3x(k)^3-5x(k)^2+3(k)-7;

Invalid expression. Check for missing multiplication operator, missing or unbalanced delimiters, or other syntax error. To construct matrices, use brackets instead of parentheses.

    fdx=9x(k)^2-10x(k)+3;
    h=-fx/fdx;
    x(k+1)=x(k)+h;
    kk(k+1)=k+1;
    if abx(h)<.0000001
        break,end
end
disp([kk1'x'])

is it correct program...can you please check with your matlab program.my matlab getting some problem so that i ask you to just check and run for me.inform me the result...

Answer 1

[Guillaume]

I can tell you the result without even trying to run your code. it's going to error with Unexpected MATLAB expression on fx = 3x....

Perhaps you meant fx = 3*x...

Also, note that the line x(1); does absolutely nothing. Maybe you meant to assign a value to it?

[Jobayer Rahman]

x(1)=0 i need matrix value

Answer 2

[VBBV]

x(1) = 0;  % assuming x(1) = 0
kk(1)=1;
for k=1:100;
    fx=3*x(k)^3-5*x(k)^2+3*x(k)-7;  % use multplication operator for products in each terms 
    fdx=9*x(k)^2-10*x(k)+3; % use multplication operator for products in each terms 
    h=-fx/fdx;
    x(k+1)=x(k)+h;
    kk(k+1)=k+1;
    if abs(h)<.0000001  % there is no abx function in Matlab,  it must be abs 
      break;
    end
end
disp([kk' x'])  % There is no kk1 array, instead it is kk as calculated inside the loop

    1.0000         0
    2.0000    2.3333
    3.0000    1.9535
    4.0000    1.8331
    5.0000    1.8212
    6.0000    1.8211
    7.0000    1.8211

plot(kk,x); grid ; xlabel('Iteration [-]'); ylabel('x')