Re: FoodSpace Problems

[Paul E Johnson]

I don't know why you are trying to do this with an *.scm file, but I can 
warn you that many people get the format of the *.scm file incorrect and 
then it does not work. Numerical values have to have letters after them 
representing variable types.  Its pretty fussy about formatting too.

Heres a clip from one example showing an integer, a double, and a 
boolean in an scm file.

 #:lastIdenticalCall 200
 #:parochialism 0.500000D0
 #:consistentAdjustment #t

I've got some comments below.

Stacy Oerder wrote:
> Hi
>
> Thanks for previous advice with regards to the values stored in
> foodspace, after taking into account that foodspace should have
> integers, my problem diminshed but didn't solve totally. Included below
> are a copy of my foodspace.h and foodspace.m files. Using my variables
> declared in my prey.scm file my foodspace correctly reads in my original
> food value but is still not reading in the size of my world and I'm
> having a problem with my -addFood method as it doesn't seem to register
> my foodvalue at the xy position which is initially the original food and
> then changes each time step as food is added and eaten. If anyone has
> any suggestions I'd greatly appreciate it, I am a new user and some of
> the use of the language may be incorrect. I have tried to follow
> existing examples in the writing of my code to date.
>
> //FoodSpace.h      
>
>
> #import <space/Discrete2d.h>
> #import <space.h>
>
> typedef int FoodValue;
>
> @interface FoodSpace : Discrete2d {
> }
> int x, y;
> int worldXSize, worldYSize;
> int foodHere;
> int extraFood;
> int origFood;
> int newFood;
>
> -setOriginalFood: (int) origFood;
> -addFood: (FoodValue)newFood X: (int) x Y: (int) y;
>
> @end
>
>
> //FoodSpace.m       
>
> #import "FoodSpace.h"
> #import <random.h>
>
> @implementation FoodSpace
>
> -setOriginalFood: (int) origFood {
>         for (x = 0; x<worldXSize; x++)
>                 for (y = 0; y<worldYSize; y++)
>                         [self putValue: origFood atX: x Y: y];
>         return self;
>         }
You have a problem here, I don't understand even why this compiles. If 
you have an instance variable origFood, the compiler should yell at you 
about using that same name as the input variable in the setOriginalFood 
method.  You either don't need to input that variable or you don't need 
the IVAR. IF it is an IVAR and the value is defined, all you need is:

-setOriginalFood {
        for (x = 0; x<worldXSize; x++)
                for (y = 0; y<worldYSize; y++)
 	 
	[self putValue: origFood atX: x Y: y];
        return self;
        }
> -addFood: (FoodValue) newFood X: (int) x Y: (int) y {
>         foodHere = [self getValueAtX: x Y: y];
>         newFood = foodHere + newFood;
>         [self putValue: newFood atX: x Y: y];
>         
>         return self;
> }
Something looks funny about this last one. I don't know why you create the
type "FoodValue".

I don't think you need instance variables "newFood", and I'm not sure 
about extraFood.

Assuming you want to add an integer amount "newFood" to the existing 
food, should it not be:


-addFood: (int) newFood X: (int) x Y: (int) y {
        int newTotal;
        foodHere = [self getValueAtX: x Y: y];
        newTotal = foodHere + newFood;
        [self putValue: newTotal atX: x Y: y];
        
        return self;
 }

--
Paul E. Johnson                       email: address@hidden
Dept. of Political Science            http://lark.cc.ukans.edu/~pauljohn
University of Kansas                  Office: (785) 864-9086
Lawrence, Kansas 66045                FAX: (785) 864-5700


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