** Make piecewise polynomial. **

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** pp = mkpp(breaks,coefs) **

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** puts together a pp function from the breaks and coefficients input or **

** requested. The number l of polynomial pieces is determined as **

** l := length(breaks)-1 . **

** The order k of the pp is obtained as **

** k := length(coefs)/l , **

** and this ratio had better be an integer. **

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** See also UNMKPP , PPVAL , SPLINE . **

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