Skip to content

add True, False #292

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 8 commits into
base: master
Choose a base branch
from
Open

add True, False #292

Show file tree
Hide file tree
Changes from 1 commit
Commits
Show all changes
8 commits
Select commit Hold shift + click to select a range
e641dd2
add True, False
jverzani Apr 2, 2025
e5719ad
Merge branch 'master' into issue_260b
jverzani Apr 2, 2025
19a5509
integrate with N
jverzani Apr 3, 2025
ca3de9b
Alternative for True/False values
jverzani Apr 4, 2025
1d379d3
Try out global map
jverzani Apr 4, 2025
f489a51
add test
jverzani Apr 4, 2025
83f0e8d
oops
jverzani Apr 4, 2025
898f53d
add negative infinity
jverzani Apr 5, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
5 changes: 4 additions & 1 deletion src/mathops.jl
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -95,7 +95,7 @@ Base.one(::Type{T}) where {T<:BasicType} = BasicType(Basic(1))
## Math constants
## no oo!

for op in [:IM, :PI, :E, :EulerGamma, :Catalan, :GoldenRatio, :oo, :zoo, :NAN]
for op in [:IM, :PI, :E, :EulerGamma, :Catalan, :GoldenRatio, :oo, :zoo, :NAN, :ZERO, :ONE, :MINUSONE]
@eval begin
const $op = Basic(C_NULL)
end
Expand Down Expand Up @@ -127,6 +127,9 @@ function init_constants()
@init_constant oo infinity
@init_constant zoo complex_infinity
@init_constant NAN nan
@init_constant ZERO zero
@init_constant ONE one
@init_constant MINUSONE minus_one
ccall((:bool_set_true, libsymengine), Nothing, (Ref{Basic},), True)
ccall((:bool_set_false, libsymengine), Nothing, (Ref{Basic},), False)
end
Expand Down
12 changes: 6 additions & 6 deletions src/numerics.jl
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,11 @@ function evalf(b::Basic, bits::Integer=53, real::Bool=false)
if status == 0
return c
else
# replace any True/False with 1/0
m = CMapBasicBasic()
m[True] = ONE; m[False] = ZERO
Copy link
Member

@isuruf isuruf Apr 4, 2025

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Can we make this map a global variable instead of creating it every time?

Copy link
Contributor Author

@jverzani jverzani Apr 4, 2025

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

I need your help with that. I was trying, but kept getting segfaults. The construction of Basic objects is a bit different than that of CMapBasicBasic, so I was having issue initializing the map in __init__.

One thing about what I have here that bothers me is I'd like to cheaply test if an expression has a BooleanAtom and then try to evaluate that expression after substitution with evalf, but it seemed easier to do the substitution and then compare the result to the original. I wasn't sure if substituting in a map with no matches would always return the original expression, as the test has that assumption.

Copy link
Contributor Author

@jverzani jverzani Apr 4, 2025

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

I just checked in what I thought I'd tried earlier and it seems to not cause an issue. I'll add a direct test to be sure.

b′ = subs(b, m)
b′ != b && return evalf(b′, bits, real)
throw(ArgumentError("symbolic value cannot be evaluated to a numeric value"))
end
end
Expand Down Expand Up @@ -125,12 +130,7 @@ end
function N(::Val{<:Any}, b::Basic)
is_constant(b) ||
throw(ArgumentError("Object can have no free symbols"))

# replace any True/False with 1/0
m = CMapBasicBasic()
m[True] = Basic(1); m[False] = Basic(0)

out = evalf(subs(b, m))
out = evalf(b)
imag(out) == Basic(0.0) ? N(real(out)) : N(out)
end

Expand Down
Loading