Tag Archives: ti

Mapping Functions in R

I have been buffing up on some areas of Math that I felt rusty in. One of the tools I was using was my old TI-82 calculator I used in high school.

TI-82 Graphing Calculator

I even got the TI Connect software working where I could download screenshots, etc.

TI-82 Screen Cap of Sin, Cos, Tan

You can put in data sets (see screen cap below), and do some graphing and some statistical analysis.

Data Entry on TI-82

However, mapping functions is a more straight forward use of the calculator. Which got me thinking… How does one do that in R?

I did a little digging. With the traditional R graphics and plotting functions, you would use curve() to draw a function. It works fine, but I like to use ggplot2 when I can.

Turns out ggplot2 supports this well. The following code sample maps the same functions I was mapping on the calculator (sin, cos, and tan from 0 to 2pi radians).

And the resulting graph is…

ggplot2 Trig Function Graphing