"IF" function

Altair Forum User

Submitted by gingergine on Wed, 02/10/2010 - 12:59 

 

Does VisSim have an 'IF' function? I have tried with the Boolean's <= but it only yields a 0 if false. I am trying to create a function such that 'IF y less than or equals to 3, y = 3, IF y more than 3, then it is whatever the value of y is'. Thanks.

Altair Forum User

 

Submitted by Richd on Wed, 02/10/2010 - 19:48.

One way to do if or if-then is to use the 'merge block'. It has 3 inputs and 1 output. The output value is either the value on input pin 2 (true) or pin 3 (false) depending on the true/false value of the 'selector' on input pin 1.

However, your case of low bound limiting of y could be handled by a single limit block with low bound set to 3 and upper bound set to a suitable infinity (1e300).

The case block is similar to merge, except that instead of a Boolean top selector, it is a numeric index selector with a variable number of selection pins. If the selector has value 2 the output pin result is the value on input pin '2'.