Math.tan

Posted on Thu 24th, December 2015

• #1

Sacha

Hi Gordon

This code works in node, but on a espruino we get NaN

R2D=57.29577951308;
D2R=0.01745329251;
L=1430093322686.17651367187;
RA = R2D * Math.atan(0.91764 * Math.tan(L * D2R));
console.log('Gordon:'+RA);

Node:

root@purple:~# cat test.js 
R2D=57.29577951308;
D2R=0.01745329251;
L=1430093322686.17651367187;
RA = R2D * Math.atan(0.91764 * Math.tan(L * D2R));
console.log('Gordon:'+RA);

root@purple:~# node test.js 
Gordon: 49.01889864197386
root@purple:~#

Espruino 1V84:

 _____                 _
|   __|___ ___ ___ _ _|_|___ ___
|   __|_ -| . |  _| | | |   | . |
|_____|___|  _|_| |___|_|_|_|___|
          |_| http://espruino.com
 1v84 Copyright 2015 G.Williams
>echo(0);
Gordon:NaN
=undefined
>

Merry Christmas

Sacha

• #2

tve

>RA = R2D * Math.atan(0.91764 * Math.tan((L * D2R)%3.14159265359));
=48.92394847104

• #3

Gordon

Thanks - so we're saying that Math.tan only works between -PI and PI? Should be easy enough to fix

Post a reply
- Bold
- Italics
- Link
- Image
- List
- Quote
- code
- Preview
Formatting Help

Don't worry about formatting, just type in the text and we'll take care of making sense of it. We will auto-convert links, and if you put asterisks around words we will make them bold.

Tips:

Create headers by underlining text with ==== or ----

To *italicise* text put one asterisk each side of the word

To **bold** text put two asterisks each side of the word

Embed images by entering:
![](https://www.google.co.uk/images/srpr/logo4w.png)
That's the hard one: exclamation, square brackets and then the URL to the image in brackets.

* Create lists by starting lines with asterisks

1. Create numbered lists by starting lines with a number and a dot

> Quote text by starting lines with >

Mention another user by @username

For syntax highlighting, surround the code block with three backticks:

```
Your code goes here
```
Just like Github, a blank line must precede a code block.

If you upload more than 5 files we will display all attachments as thumbnails.

For a full reference visit the Markdown syntax.

Math.tan

About

Math.tan

Actions

Math.tan

Formatting Help

About

Math.tan

Actions

Espruino