topic Re: Round down Integer to odd number. in Mathcad

Round down Integer to odd number.

ppal — Mon, 22 Jul 2024 00:44:52 GMT

Lets say I have an integer

If even number then round down to an odd number.

If odd then keep the number.

eg. x = 888

I want to round this down to an odd number. 887

Thank you.

terryhendicott — Mon, 22 Jul 2024 01:08:42 GMT

Hi,

Like this using two functions.

Cheers

Terry

Werner_E — Mon, 22 Jul 2024 02:17:40 GMT

Should this also apply to zero and negative integers?

At least that's what your description demands and what Terry's solution provides.

BTW, if your inputs are only integers, you may also omit the "floor" functions:

If you intend to use the function for positive integers only, you may also try this:

Note the capital "R" in "Round". You see that the result for negative odd inputs is 'wrong'.

In case you rather intend to round "in the direction of zero" (basically apply the rounding to the absolute value of the input) you may use

Of course you get the same result with

And at last here is an alternative function doing exactly what you demanded (and what Terry's function also provides)

ppal — Mon, 22 Jul 2024 02:47:59 GMT

Just positive

Werner_E — Mon, 22 Jul 2024 10:47:04 GMT

@ppal wrote:

Just positive

Then you can use any of the five suggestions.