Sin() cos() functions acting strangely

[psemme]

Hello,
Can’t understand this:

• In one simple sketch sin(30) and cos(30) produce results that appear incorrect while the exact same code in another sketch (from the Examples section) returns the correct result.

• Here’s the code in each sketch (placed in the Setup section)
  print(sin(30));
  print(cos(30));

• Screenshot of the erroneous sketch + console output is attached (as a newbie I can only attach one pic). Thx for whatever insights anyone can provide!

[jb4x]

Hello, you need to pay attention if you are working in degrees or in radians. You can change the mode with the angleMode() function.

[CodeMasterX]

Hi! Default setting for both Processing and p5.js are radians. They are similar to the ° (degrees (360)) we use in Europe, however, they are between 0 and PI*2 (TWO_PI). There are several ways to make turn degrees into radians;

• use formula: degrees*TWO_PI/360
• use map function: map(degrees,0,360,0,TWO_PI)
• use inbuilt functions: radians(degrees)
• use angleMode (p5 only); angleMode(DEGREES);

I hope this helps

[glv]

Hello @psemme,

You should always refer to the references:
reference | p5.js

In this case sin() and cos() also reference angleMode() which provides a good example.

References:

Other references:

• Degree (angle) - Wikipedia

• Radian - Wikipedia States that:
  The radian , denoted by the symbol {\displaystyle {\text{rad}}},[1] is the SI unit for measuring angles, and is the standard unit of angular measure used in many areas of mathematics.

• Gradian - Wikipedia

Have fun!

:)

[psemme]

Ok - I’m embarrassed. I should have figured that out! Thx!

[psemme]

Thank you! Don’t know why I didn’t remember this basic setting!

[psemme]

Thank you! Appreciate the quick response.