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# This file demonstrates how to access a java file contained in a
# jar file, how to extend the java object and make a numeric
# class interact seamlessly with normal ruby numeric objects
# load the jar file
require '../jBLAS.jar'
# We provide a short-cut for the class com.fhg.core.DoubleComplex
DoubleComplex = Java::edu.ida.core.DoubleComplex
# we extend the class
class DoubleComplex
# add operators
def +(o); add(promote(o)); end
def -(o); sub(promote(o)); end
def *(o); mul(promote(o)); end
def /(o); div(promote(o)); end
# extend the range of the operators to also deal with
# non-complex numeric arguments
def promote(o)
if Numeric === o
DoubleComplex.new(o, 0)
else
o
end
end
# make sure that it also works when the left hand side operator
# is not a double
def coerce(o)
unless DoubleComplex === o
[self, o]
end
end
# to make sure that we look pretty in irb
def inspect
toString
end
end
# imaginary number
I = DoubleComplex.new(0, 1)
# and voila, it works!
puts (1 + 3*I)/ 2*I
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