I (Built-in Mathematica Symbol)

I represents the imaginary unit Sqrt[-1].

Quantile (Built-in Mathematica Symbol)

Quantile[list, q] gives the q\[Null]\[Null]^th quantile of list. Quantile[list, {q_1, q_2, ...}] gives a list of quantiles q_1, q_2, .... Quantile[list, q, {{a, b}, {c, d}}] ...

RealDigits (Built-in Mathematica Symbol)

RealDigits[x] gives a list of the digits in the approximate real number x, together with the number of digits that are to the left of the decimal point. RealDigits[x, b] ...

Sign (Built-in Mathematica Symbol)

Sign[x] gives -1, 0, or 1 depending on whether x is negative, zero, or positive.

Abs (Built-in Mathematica Symbol)

Abs[z] gives the absolute value of the real or complex number z.

GenomeData (Built-in Mathematica Symbol)

GenomeData["gene"] gives the DNA sequence for the specified gene on the reference human genome.GenomeData["gene", " property"] gives the value of the specified property for ...

Im (Built-in Mathematica Symbol)

Im[z] gives the imaginary part of the complex number z.

MapIndexed (Built-in Mathematica Symbol)

MapIndexed[f, expr] applies f to the elements of expr, giving the part specification of each element as a second argument to f. MapIndexed[f, expr, levelspec] applies f to ...

Introduction to Differential Equation ... (Mathematica Tutorial)

The Mathematica function DSolve finds symbolic solutions to differential equations. (The Mathematica function NDSolve, on the other hand, is a general numerical differential ...

Why You Do Not Usually Need to Know ... (Mathematica Tutorial)

Most of the documentation provided for Mathematica is concerned with explaining what Mathematica does, not how it does it. But the purpose of this is to say at least a little ...