sin(90) after angleMode(DEGREES) gives different result to sin(radians(90))

[rruubboott]

Most appropriate sub-area of p5.js?

• Accessibility
• Color
• Core/Environment/Rendering
• Data
• DOM
• Events
• Image
• IO
• Math
• Typography
• Utilities
• p5.strands
• WebGL
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• Other (specify if possible)

p5.js version

1.11.13

Web browser and version

146.0.7680.178 (Official Build) (arm64)

Operating system

mac OS Sequoia 15.7.3

Steps to reproduce this

Steps:

Snippet:

// Paste your code here :)

function setup() {
  createCanvas(400, 400);
  angleMode(DEGREES);
  console.log(sin(90)); // 1
  
  console.log(sin(radians(90))); // 0.027412133592044294
}

[rruubboott]

I get very different results from using sin() after i switch to angleMode(DEGREES) than using radians. Also angleMode(DEGREES) returns results outside of -1, to 1!
Any ideas?

[harshiltewari2004]

Hi ,can I work on this?

[davepagurek]

Hi! The radians function just converts a number from one set of units to another, but the result is still just a number. sin will always interpret whatever number you pass in according to the units of angleMode regardless of where that number came from. In your second console.log, you're passing in radians(90), which is 1.57sh. But since the angle mode is degrees, when you pass that into sin, it's giving you the sine of of 1.57 degrees (not radians).

If you change the angle mode back to radians, it'd work as expected:

angleMode(RADIANS);
console.log(sin(radians(90))); // 1