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JLS
11-03-2010, 08:02 AM
Hi all

Im new propeller user and teaching basic programming

Is possible help me with basic FloatMath example ? specialy Lorenz attractor ?

(im using Arduino and any attractor programming not problem in arduino wire code)

Sorry my bad english

Mike Green
11-03-2010, 02:14 PM
There's nothing complicated about floating point programming on the Propeller. It's all function calls.

A := B + C

becomes

A := FAdd(B, C)

and

D := - E

becomes

D := FNeg(E)

If you have something more complex, you can either separate it out into individual operations or nest the functions calls.

A := (B + C) * (D - E)

becomes

A := FMul( FAdd( B, C ) , FSub( D, E ) )

Read the documentation that comes with the floating point library from the Propeller Object Exchange. It shows you the routines that come with each version of the library. FloatMath is written in Spin, so it's relatively slow. I recommend using one of the assembly language versions instead.

ElectricAye
11-03-2010, 02:29 PM
I've attached a little more info on FloatMath.

JLS
11-03-2010, 02:48 PM
Very thanks info and examples :-)

And little question - is possible convert floating value to integer ? (for controlling sound or lcd etc...)

example floating value 1.256

integer value 1256

not rounded like 1

thanks

MacGeek117
11-03-2010, 02:52 PM
Absolutely, just multiply your fp number by 1000 in your case, and then truncate.
MG117

Mike Green
11-03-2010, 03:11 PM
That would be: FTrunc(FMul(1.256,1000.0))

JLS
11-03-2010, 04:59 PM
many thanks :-)

JLS
11-03-2010, 05:38 PM
My first working code :-)

Lorenz 3D fractal map and nokia 6100 lcd

Thanks previous help

JLS
11-03-2010, 05:56 PM
Delayed logistic map

JLS
11-03-2010, 06:07 PM