use subplot for ploting multiple graph in matlab

Question

i can't understand what is reason for following error?here is given code

for i=1:20 
      x(i) = i-10; 
      squared(i) = x(i) ^ 2; 
      cube(i) = x(i) ^ 3; 
      linear(i) = x(i); 
      log_of(i) = log(x(i)); 
      sqrt_of(i) = sqrt(x(i)); 
    end 
    subplot(2,3,1); 
    plot(x,squared); 
    title('square'); 

        subplot(2,3,4); 
    plot(sqrt_of,cube); 
    title('sqrt'); 

    subplot(2,3,5); 
    plot(linear,cube); 
    title('linear'); 

    subplot(2,3,6); 
    plot(log_of,cube); 
    title('log'); 


    subplot(2,3,3); 
    plot(x,cube); 
    title('cube'); 

and error says

subplot1
Attempt to execute SCRIPT subplot as a function:
C:\Users\D.Datuashvili\Desktop\subplot.m

Error in subplot1 (line 9)
    subplot(2,3,1);

it seems everything ok in code, but why is following error?could you help me? EDITED:

for i=1:20 
      x(i) = i-10; 
      squared(i) = x(i).^ 2; 
      cube(i) = x(i).^ 3; 
      linear(i) = x(i); 
      log_of(i) = log(x(i)); 
      sqrt_of(i) = sqrt(x(i)); 
    end 
    subplot(2,3,1); 
    plot(x,squared); 
    title('square'); 

        subplot(2,3,4); 
    plot(sqrt_of,cube); 
    title('sqrt'); 

    subplot(2,3,5); 
    plot(linear,cube); 
    title('linear'); 

    subplot(2,3,6); 
    plot(log_of,cube); 
    title('log'); 


    subplot(2,3,3); 
    plot(x,cube); 
    title('cube'); 

error:

 subplot1
Error using plot
Vectors must be the same lengths.

Error in subplot1 (line 10)
    plot(x,squared);

Answer 1

Probably there is a file named subplot in your workspace

Answer 2

As noted above, the first error most comes from your file C:\Users\D.Datuashvili\Desktop\subplot.m which shadows the Matlab default.

the second error comes from the fact that the length of array squared is longer, probably because you changed it earlier.

just add the following line before your script and it will be fine

 clear squared cube linear log-of sqrt_of