How to plot functions within a range?

My question is how to plot trigonometric functions within a specified range. This is the code fragment from the script

    x = linspace(-2*pi, 2*pi);
    y = tan(x);
    dy = diff(y);
    plot(x,y,x,dy);

When I run the code I receive de following error.

Error using plot
Vectors must be the same length.

Any sort of help and advice is more than welcome

Answer 1

[Sujit Muduli]

Hi Jose,

It is clear from the error that there are mismatches in the size of the arguments that you have provided to plot function. I checked the size of dy is 99 where rest are 100.

I don't know what is your exact use case here, but you may modify your logic a bit to work around this error by making length(dy) = 100.

Here is the documentation link for plot function which you may find useful, https://in.mathworks.com/help/matlab/ref/plot.html

Thanks,

Sujit

[Jose Ignacio Del Valle Bustillo]

Thank you, Sujit for your help its work inglés fine now

Answer 2

[Walter Roberson]

You are applying diff() to a numeric array. That is defined by simple numeric differences.

If you were to use points closer and closer together then the mathematical limit as the distance approaches 0 would be the calculus differentiation. But only in the limit: numeric diff() approximates derivative half way between points.