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MathGroup Archive 1996

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If[] and % problem

  • To: mathgroup at smc.vnet.net
  • Subject: [mg5444] If[] and % problem
  • From: Sherman Reed <Sherman.Reed at worldnet.att.net>
  • Date: Sat, 7 Dec 1996 00:26:20 -0500
  • Sender: owner-wri-mathgroup at wolfram.com

        Hans,

        Here is how I see it:

        i^2+v^2
                THIS IS EITHER A NUMBER 
                OR AN EXPRESSION(A FUNCTION 
                OF I AND V)
                IF IT IS A NUMBER THE SECOND
                STATEMENT WILL WORK AND THE
                THIRD STATEMENT WILL PLOT A 
                CONSTANT.
                IF IT IS AN EXPRESSION, THE
                SECOND STATEMENT WILL FAIL
                I AM NOT SURE WHAT THE PLOT3D
                STATEMENT WILL DO, PROBABLY
                NOTHING.
        
        A non-elegant fix is the following:

        g[i_,v_]:=i^2 + v^2
                may have to isolate g[i,v]
                for the next two statements
                using the Block function
        If[g[constanti,constantv]>15,15,g[i_,v_]   
        Plot3D[g[i,v],{i,-5,5},{v,-5,5}]



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