This addresses the problem some users experienced, in which FormCalc saved an "empty" data file in some instances when layout data had not changed. This required switching to a new license management system, so prior-version license codes will not work with this version. If your license was purchased within the prior year, email us to request a new code, free of charge. If your license is more than one year old you must purchase an upgrade, here. Fixed minor bugs.
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Returns the absolute value of a numeric value or expression. None Locates the starting character position of a string within another string. None Returns the whole number greater than or equal to a given number. None Returns the concatenation of two or more strings. None CTerm n1, n2, n3 Returns the number of periods needed for an investment earning a fixed, but compounded, interest rate to grow to a future value.
None Returns the current system date as the number of days since the epoch. Date2Num d1 [, f1 [, k1 ] ] Returns the number of days since the epoch, given a date string.
None Returns the decoded version of a given string. Encode s1 [, s2 ] Returns the encoded version of a given string. Eval Returns the value of a given form calculation. None Returns the largest whole number that is less than or equal to the given value. None FV n1, n2, n3 Returns the future value of consistent payment amounts made at regular intervals at a constant interest rate. None Downloads the contents of the given URL. None HasValue v1 Determines whether the given parameter is a valid reference syntax with a non-null, non-empty, or non-blank value.
None IPmt n1, n2, n3, n4, n5 Returns the amount of interest paid on a loan over a set time. None Returns the number of days since the epoch, given a valid date string.
None Returns the number of milliseconds since the epoch, given a valid time string. None Left s1, n1 Extracts a specified number of characters from a string, starting with the first character on the left. None Returns a localized time format string, given a time format style.
None Oneof s1, s2 [, s None This function is similar to the String.
It reads diagrams generated with FeynArts and returns the results in a way well suited for further numerical and analytical evaluation. FormCalc can in fact write out a complete Fortran or C subroutine to compute the squared matrix element for a given process. In addition to a comprehensive manual, several demo calculations are included in the FormCalc distribution, which show how the programs are used. What it does The following simplifications are performed by FormCalc: indices are contracted as far as possible, fermion traces are evaluated, open fermion chains are simplified using the Dirac equation, color structures are simplified using the SU N algebra, the tensor reduction is done, local terms the remnants of divergent integrals are added, the results are partially factored, abbreviations are introduced. The output is in general a linear combination of loop integrals with prefactors that contain model parameters, kinematic variables, and abbreviations introduced by FormCalc. Such abbreviations are introduced for spinor chains, scalar products of vectors, and epsilon tensors contracted with vectors.
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