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AboutAll PostsWarningRandom

Inverse of a Function

  1. const expoIn = t => 
  2.   (t==0) ? 0 : Math.pow(2, 10 * (t - 1))
  3.  
  4. const expoInInverse= t => 
  5.   (t==0) ? 0 : ((Math.log(t) + 10 * Math.log(2)) / Math.log(2)) / 10
  6.  
  7.  
  8. console.log(expoIn(.35) + ' ' +  expoInInverse(expoIn(.35)))

Very nice inverse function calculator by user fawad over at Wolfram Alpha. Was attempting to invert a standard “exponential in” easing function – after some futzing I resorted to the calculator 😀

// javascript // math

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