Troubleshooting Matlab Code: Tips and Tricks for Beginners

[eliassiguenza]

Anyone Help Matlab! Please!?

I am pretty bad at using matlab, i have never used it before and i don't know what's wrong with my code, i would honestly appreciate if someone could give me a hand.

Script:
x=linspace(0,5,10)';
y=[2.75 4.83 5.05 6.80 8.83 8.64 11.03 13.20 13.08 15.68]';
sy=[0.5 0.6 0.7 0.8 0.9 0.9 1.0 1.1 1.1 1.2]';
[c,sc]=regress(x,y,sy,1);
plot(x,polyval(c,x),x,y,'o');
errbar(x,y,sy)

Function:

function sc = cerror_2(x,y,sy)
% This function calculates the errors in the fitted coefficients a and b for
% a straight line fitting problem.

A=(sum (x.^2) ./ (sy.^2));

B=(sum (1 ./ sy.^2));

C=(((sum (1./sy.^2) * ((sum (x.^2) ./ (sy.^2))) - (sum (x./sy.^2)))));

sa = (1./C.*A);

sb = (1./C.*B);

sy = [sb,sa];


end

Error

? Error using ==> regress
Too many input arguments.

Error in ==> Problem11_Executer at 4
[c,sc]=regress(x,y,sy,1);

 

[SSJVegetto]

I am pretty bad at using matlab, i have never used it before and i don't know what's wrong with my code, i would honestly appreciate if someone could give me a hand.

Script:
x=linspace(0,5,10)';
y=[2.75 4.83 5.05 6.80 8.83 8.64 11.03 13.20 13.08 15.68]';
sy=[0.5 0.6 0.7 0.8 0.9 0.9 1.0 1.1 1.1 1.2]';
[c,sc]=regress(x,y,sy,1);
plot(x,polyval(c,x),x,y,'o');
errbar(x,y,sy)

Function:

function sc = cerror_2(x,y,sy)
% This function calculates the errors in the fitted coefficients a and b for
% a straight line fitting problem.

A=(sum (x.^2) ./ (sy.^2));

B=(sum (1 ./ sy.^2));

C=(((sum (1./sy.^2) * ((sum (x.^2) ./ (sy.^2))) - (sum (x./sy.^2)))));

sa = (1./C.*A);

sb = (1./C.*B);

sy = [sb,sa];end

Error

? Error using ==> regress
Too many input arguments.

Error in ==> Problem11_Executer at 4
[c,sc]=regress(x,y,sy,1);

It seems to me MATLAB doesn't like the way you call the function regress. See http://www.mathworks.com/help/toolbox/stats/regress.html". If you need any help just ask but i think you should get the answer by reading the link i gave you! You have to many arguments and i think you want to put the first 2 arguments in a matrix form.

P.S. i don't think this is advanced physics!