How can I solve this error?

• I was designing a C program that calculates FS partial-sum approximation but getting this error. How can i solve this?*

Warning: Imaginary parts of complex X and/or Y arguments ignored 

Error using axis>LocSetLimits (line 308)

Vector must have 4, 6, or 8 elements.

Error in axis (line 101)

LocSetLimits(ax(j),cur_arg,names);

Code that I used is looks like below:

>>k = 1:1:99;

>>t = linspace(-0.5,0.5,400);

>>B = zeros(1,100);

>>B(1) = 0; % for k=0

>>B(2:1:100) = 8*sin(k*pi/2).*exp(1i*pi*k/2)./(1i*(pi*k).^2);

>>xJhat(1,:) = B(1)*cos(0*2*pi*t);

>>for k = 2:1:100

Bcos(k,:) = B(k)*cos((k-1)*2*pi*t);

xJhat(k,:) = xJhat(k-1,:)+B(k)*cos((k-1)*2*pi*t);

end

>>j = [1 3 7 29 99]+1;

>>for i = 1:1:5

subplot(5,2,2*i-1);plot(t,Bcos(j(i),:));

ylabel(['B[' num2str(j(i)-1) ']cos(' num2str(j(i)-1) '\omega_0n)']);

xlabel('n');axis([-0.5 0.5-1 1]);

subplot(5,2,2*i);plot(t,xJhat(j(i),:));

ylabel(['x' num2str(j(i)-1) '(t)']);

xlabel('n');

end

Answer 1

[Walter Roberson]

You have

axis([-0.5 0.5-1 1])

and you probably intended

axis([-0.5 0.5 -1 1])

[Stephen23]

... which is a good example of why it is better to explicitly separate array elements using commas, rather than relying on implicit separation using spaces:

axis([-0.5,0.5,-1,1])