Feature #10225 » _ NEWS About Math.normcdf.PATCH
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* Most symbols which are returned by String#to_sym and
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String#intern are GC-able.
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* Math
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* New method:
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* Math.normcdf(x) returns cumulative distribution function (CDF) of the standard normal distribution for +x+.
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* Matrix
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* New methods:
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* Matrix#first_minor(row, column) returns the submatrix obtained
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