Re: boolean variable with contours

*To*: mathgroup at smc.vnet.net*Subject*: [mg110697] Re: boolean variable with contours*From*: Leonid Shifrin <lshifr at gmail.com>*Date*: Fri, 2 Jul 2010 07:27:06 -0400 (EDT)

Hi Maria, First, your <pi> in <i==pi/12> must be <Pi>, I guess. Then, you list several functions separated by a comma, and ContourPlot does not understand. This works, for instance: ContourPlot[ 2*R3*Sin[ArcCos[Re[x/R3]]]*e3 + 2*R2/Cos[i]*Sin[ArcCos[Re[x/2.92]]]*(e2 - e3) + 2*R1/Cos[i]*Sin[ArcCos[Re[x/R1]]]*(e1 - e2), {x, -2, 2}, {y, -20, 20}] What did you mean by separating functions with a comma - what did you try to achieve? Knowing this it would be easier to help. Regards, Leonid On Thu, Jul 1, 2010 at 11:54 PM, maria giovanna dainotti < mariagiovannadainotti at yahoo.it> wrote: > Dear Math Group, > I have the following problem when I do a contourplot I can't use > the boolean variabile. This is the function for which I would like > to have the contours > > R1==1.029 > R2==2.92 > R3= > e1==300 > e2==1 > e3==100 > i==pi/12 > > ContourPlot[2*R3*Sin[ArcCos[Re[x/R3]]]*e3+2*R2/Cos[i]*Sin[ArcCos[Re[x/2.= 92]]]*(e2-e3)+2*R1/Cos[i]*Sin[ArcCos[Re[x/R1]]]*(e1-e2),(2*R3*Sin[ArcCos[Re= [x/R3]]]*e3+2*R2/Cos[i]*Sin[ArcCos[Re[x/R2]]]*(e2-e3))*(Boole[-R2<x<-R1]+Bo= ole[R2>x>R1]),2*R3*Sin[ArcCos[Re[x/R3]]]*e3*(Boole[x<-R2]+Boole[x>R2])+R3*C= os[ArcSin[y/R3]],{x,-2,2 > },{y,-20,20}] > > > Thanks a lot for your help > Maria >