Maths Question - Is There An Easier Answer.

Blitz3D Forums/Blitz3D Beginners Area/Maths Question - Is There An Easier Answer.

Maximus Primal

(Posted 2005) [#1]

Sorry. My maths is really poor these days.

I need to convert a negative number into it's positive version for use as a speed control on an analog joystick.

I am currently using this:

	percent1#=JoyZ()
	percent2#=1+percent1#
	percent1#=1-percent2#
	max_speed=top_speed*percent1

Is there an easier way of making a negative number positive. My method works but something tells me you can do it in one equation and not two as I am. I know this might sound like nitpicking but silly things like this annoy me at times.

Max

BlitzSupport

(Posted 2005) [#2]

Use Abs (value).

Who was John Galt?

(Posted 2005) [#3]

or if you know percent 1 is -ve in the first place, use -percent1

Andy	(Posted 2005) [#4]

If you need to reverse a direction, say from -50 to +50 or +50 to -50, then just multiply by -1.

ANdy

Maximus Primal

(Posted 2005) [#5]

Wow good selection of answers! :) Thanks a lot guys.

Time to play a little...

Max

Just changed it to:

	max_speed=top_speed*(Abs(JoyZ()))

Now that looks a LOT nicer. And I can follow it too! :)

Thanks again.

Shagwana

(Posted 2005) [#6]

if you know a number is negative you can do

num=0-num

to make it posative

Bot Builder

(Posted 2005) [#7]

or just num=-num, slenkar :)

Maximus Primal

(Posted 2005) [#8]

num=-num? THAT simple? Damm. Oh well I will stick with what I have. Didn't realise that such a simple maths question had so many solutions...

Max

DH	(Posted 2005) [#9]

Sorry. My maths is really poor these days.

Lucky for you functions exist that for this type of thing eh :-)