Knowledge Base/Using the Desmos graphing calculator/User Guide Topics

Restrictions (piecewise)

Team Desmos
posted this on November 21, 2012 19:23

To limit the domain or range (x or y values of a graph), you can add the restriction to the end of your equation in curly brackets {}. For example, y=2x{x>0} would graph the line y=2x for x values greater than 0.

To try it out in Desmos, click the Restrictions Tour in the help menu:

Screen_Shot_2013-12-29_at_9.31.26_PM.png

 

 

Comments

User photo
Nathan Solomon

 fsdgadsfgad

September 18, 2013 10:03
User photo
Brendon Hackett

that is very helpful, can you show us how to do a step peicewise?

December 12, 2013 11:46
User photo
Fabrice Neyret

More:

- you can cumulate conditions:    y = sin ( x/a )   { a > 0 } { 0 <= x <= a*pi }

- for parametrics curve, the condition must be *in* the parenthesis:  ( t,  sin ( t/a )   { a > 0 }  )

- you can also use the  "if elseif else" version :  y = { a <= 0 : 0 ,   0 <= x <= a*pi  : sin ( x/a )  , 0 )

  with any number of cond : expression terms, and the default (final) expression is not mandatory

January 08, 2014 21:28
User photo
Alexandre Gurchumelia

It's missing the very important part, making piecewise function in single line, so that when you differentiate it or use it in any why elsewhere, the function remains whole. Syntax is:

F(x)={x≤0 : x², 0<x<π/2 : 2x/π, x≥π/2 : sin(x)}

Now it's usable in any situation, for instance:
https://www.desmos.com/calculator/y9bbgn6ul9

June 21, 2014 07:00