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parse derivatives instead of just relying on tree #887

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parse derivatives instead of just relying on tree #887

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6 changes: 5 additions & 1 deletion lib/Parser/Differentiation.pm
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Original file line number Diff line number Diff line change
Expand Up @@ -39,7 +39,11 @@ sub Parser::D {
return (0 * $self)->reduce('0*x' => 1) unless defined $self->{variables}{$x};
$f = $f->D($x);
}
return $self->new($f);
my $deriv = $self->new($f);
$deriv->{string} = $deriv->{tree}->string;
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This line means that any constants are clipped to 6 significant digits (the default number format), so the result may have different from the original.

You may also want to add a new reduction rule that controls doing this doing this, so it can be turned off, if desired.

$deriv->tokenize;
$deriv->parse;
return $deriv;
}

#
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