# Luiz Felipe Santos

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 Jan31 comment Calculating volume @halirutan The MinRecursion doesn't work either. Jan30 comment Calculating volume @halirutan When I said: "as it goes from 0 to 540 and does not assume any other value between this range", I meant that, i.e., for any vmax <= 1000 I get a 0 and for any vmax >= 2000 I get a 540. However, when I use RegionPlot3D[], the region is not 0 when vmax = 1000, but continues decreasing when vmax is less than 1000. The same happens for vmax>2000: it does not reach it's maximun value when vmax=2000. I.e., for vmax = 3000, I get the same 540 though the volume has increased. Jan30 comment Calculating volume @Michael E2, Yes, but didn't work as well. And when the Integrate finds 0, NIntegrate finds the following error (I think this information does not help, but just in case...): NIntegrate::izero: Integral and error estimates are 0 on all integration subregions. Try increasing the value of the MinRecursion option. If value of integral may be 0, specify a finite value for the AccuracyGoal option Jan30 comment Calculating volume Is it possible to calculate the volume from an already plotted function (i.e. volume of the RegionPlot3D)? If it is, my problem may be solved. Jan30 comment Calculating volume Hi, Murta and Silvia! The problem is that I don't have the explicit form of radFld[]. When I used the code: Integrate[Boole[(radFld[Grp, "Bx", {x, y, z}] - Btotal)/Btotal <= vmax], {x, -3, 3}, {y, -3, 3}, {z, -10, 10}] I was just using the same method shown on Mathematica website: reference.wolfram.com/mathematica/ref/Boole.html, when they calculate the area of a circle (3rd example of Basic Examples) Jan30 awarded Student Jan30 asked Calculating volume