Wolfram Mathematica

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5:03 AM

@kirma, OK, thanks. The only workaround that I found for this issue is that it seems to be scale dependent (a precision issue). If you use `m = OpenCascadeShapeSurfaceMeshToBoundaryMesh@
OpenCascadeShapeBooleanRegion@
RegionDifference[Ball[{0, 0, 0}, 100], Ball[{0, 100, 100}, 100]]` things work. You'd then need to rescale the result.

kirma

@user21 Yep, I know. It sadly means that it's hard to rely on it without rather curious workarounds or manual checking. Not really a WRI-originated problem though.

I was excited of OpenCascade because it did seem like it could be the way to improve discretization of simple semialgebraic surfaces or such (especially on intersections).

9 hours later…

Too Fat Man No Neck

2:34 PM

Hi folks, I am wondering why some people use `()` as in the following example?

Foo[x_] := Module[{a, b, c}, (a = 1; b = 2; c = 3; a + b + c + x)]
Foo[0]

What is the purpose of () here? Please ping me if you answer this question. I am leaving...

100 centuries later...

3 hours later…

Jason B.

5:11 PM

@TooFatManNoNeck - in the case you give it serves no purpose

But often it is used as a shorthand for CompoundExpression[expr1, expr2, expr3]

JimB

6:00 PM

@TooFatManNoNeck I use the parentheses when I want to make an assignment followed by a display option such as (cov = -Inverse[hessian])//MatrixForm such that the assignment isn't affected by the display option.

Too Fat Man No Neck

@JimB: Thank you.

@JasonB.: Thank you!

Jason B.

6:33 PM

Also I sometimes see people use
myFunc[vars_] := Module[{},
doSomething[vars];
doSomethingElse[vars];
oneMoreThing[vars];
]

because they don't realize you can just do

myFunc[vars_] := (
doSomething[vars];
doSomethingElse[vars];
oneMoreThing[vars];
)

Too Fat Man No Neck

nice!!