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Minimal function cashe #2

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Merged
ComboProblem merged 2 commits into from
Aug 30, 2025
Merged

Minimal function cashe #2

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257832e
calcuate slopes in common field of breakpoints and values
ComboProblem Aug 14, 2025
32a4069
start of minimal functions cashe
ComboProblem Aug 14, 2025
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15 changes: 10 additions & 5 deletions cutgeneratingfunctionology/igp/functions.sage
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Original file line number Diff line number Diff line change
Expand Up @@ -1513,9 +1513,15 @@ def piecewise_function_from_breakpoints_slopes_and_values(bkpt, slopes, values,
if field is None:
field = default_field
# global symb_values
symb_values = bkpt + slopes + values
field_values = nice_field_values(symb_values, field)
bkpt, slopes, values = field_values[0:len(bkpt)], field_values[len(bkpt):len(bkpt)+len(slopes)], field_values[-len(values):]
if slopes is None:
symb_values = bkpt + values
field_values = nice_field_values(symb_values, field)
bkpt, values = field_values[0:len(bkpt)], field_values[-len(values):]
slopes = [(values[i+1]-values[i])/(bkpt[i+1]-bkpt[i]) if bkpt[i+1] != bkpt[i] else 0 for i in range(len(bkpt)-1)]
else:
symb_values = bkpt + slopes + values
field_values = nice_field_values(symb_values, field)
bkpt, slopes, values = field_values[0:len(bkpt)], field_values[len(bkpt):len(bkpt)+len(slopes)], field_values[-len(values):]
intercepts = [ values[i] - slopes[i]*bkpt[i] for i in range(len(slopes)) ]
# Make numbers nice
## slopes = [ canonicalize_number(slope) for slope in slopes ]
Expand Down Expand Up @@ -1546,8 +1552,7 @@ def piecewise_function_from_breakpoints_and_values(bkpt, values, field=None, mer
"""
if len(bkpt)!=len(values):
raise ValueError("Need to have the same number of breakpoints and values.")
slopes = [ (values[i+1]-values[i])/(bkpt[i+1]-bkpt[i]) if bkpt[i+1] != bkpt[i] else 0 for i in range(len(bkpt)-1) ]
return piecewise_function_from_breakpoints_slopes_and_values(bkpt, slopes, values, field, merge=merge)
return piecewise_function_from_breakpoints_slopes_and_values(bkpt, None, values, field, merge=merge)

def piecewise_function_from_breakpoints_and_slopes(bkpt, slopes, field=None, merge=True):
r"""
Expand Down
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