any idea why my sin graph looks funny?

that is plotted in scilab

one one thing when x=90 i'd expect y=1 but it isn't quite there

Because it's working in radians, not degrees, naturally. sin of 90 radians is just below 0.9

You've gone through 57.3 cycles in your plot. Click my plot to see the details. I have stretched the horizontal axis

To convert degrees to radians multiply by pi/180

so 90 degrees is pi/2 radians, for example

Hey @Glen!

Thanks for all the help and intriguing questions which made me lookup some good questions on the site and wikipedia etc.

It was for a assignment in a course of ML and I am not looking for deeper concepts in statistics.

@Glen_b thanks.. any idea how to get the x and y axis to intersect at x=y=0?

@barlop The axes always intersect at the origin ;-). If you would like to depict them, consider issuing the post-plotting commands abline(h=0) and abline(v=0).

"ML bootcamps" ;) medium.com/@gantlaborde/siraj-rival-no-thanks-fe23092ecd20?

@whuber is that matlab? or octave? I have scilab and get "Undefined variable: abline"

@barlop It's R (which is what @glen_b was using--I didn't notice you used something else). abline draws lines across the plot region. This is a basic operation in any graphics environment, so I'm sure you'll know how to do it.