CODEWITHSUNDEEP
matlab
depecheSoul
depecheSoul

Reputation: 946

Drawing a line in matlab plot

I am beginner in matlab programming, so i wrote this little programm to see it in action, and now I have a little problem because I am not sure why it is not working.

x = zeros(50);
squared = zeros(50);
cubed = zeros(50);

for num = 1:50
    x(num) = num;
    squared(num) = num^2;
    cubed(num) = num^3;
end

% calculate the mean
mean_cubed = mean(cubed);

% clear screen and hold the plot
clf;
hold on
    plot(x, squared);
    plot(x, cubed);
    plot([0, 50], [mean_cubed, mean_cubed]);
hold off

The main program is when i start the program i get a error:

Error using plot
Vectors must be the same lengths.

Error in basic_mathlab_plotting_2 (line 20)
    plot([0, limit], [mean_cubed, mean_cubed]);

I think the size of vector are the same, so i dont know what is wrong.

Thanks!!!

Upvotes: 0

Views: 67

Answers (1)

Luis Mendo
Luis Mendo

Reputation: 112659

In the first lines, you probably meant

x = zeros(1,50);
squared = zeros(1,50);
cubed = zeros(1,50);

Note that zeros(50) is equivalent to zeros(50,50) and so it returns a 50x50 matrix.

In addition, those lines and the for loop could be replaced by

x = 1:50;
squared = x.^2;
cubed = x.^3;

This applies the important concept of vectorization, by using the element-wise power operation.

Upvotes: 2

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