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# wrong expressions

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 wrong expressions on Nov 30, 2013 at 9:22:05 am

Hello, I have an expression, but does not know what is wrong. could someone help me? it always comes the error message: invalid numeric result (division by zero?) Here is the expression: amp = .1;freq = 2.0;decay = 7.0;n = 0;if (numKeys > 0){n = nearestKey(time).index;if (key(n).time > time){n--;}}if (n == 0){ t = 0;}else{t = time - key(n).time;}if (n > 0){v = velocityAtTime(key(n).time - thisComp.frameDuration/10);value + v*amp*Math.sin(freq*t*2*Math.PI)/Math.exp(decay*t);}else{value}

 Re: wrong expressionson Nov 30, 2013 at 5:42:32 pm

Try it this way:

``` amp = .1; freq = 2.0; decay = 7.0; n = 0; if (numKeys > 0){ n = nearestKey(time).index; if (key(n).time > time){ n--; } } if (n == 0){ t = 0; }else{ t = time - key(n).time; }if (n > 0 && t < 10){ v = velocityAtTime(key(n).time - thisComp.frameDuration/10); value + v*amp*Math.sin(freq*t*2*Math.PI)/Math.exp(decay*t); }else{ value } ```

Dan

```Thanks it was very helpful :D Marek```