Getting and Setting Pieces of Matrices (Mathematica Tutorial)

Ways to get pieces of matrices. Matrices in Mathematica are represented as lists of lists. You can use all the standard Mathematica list-manipulation operations on matrices. ...

UnitStep (Built-in Mathematica Symbol)

UnitStep[x] represents the unit step function, equal to 0 for x < 0 and 1 for x >= 0. UnitStep[x_1, x_2, ...] represents the multidimensional unit step function which is 1 ...

Do Linear Algebra (Mathematica How To)

These "How tos" give step-by-step instructions for common tasks related to linear algebra in Mathematica .

Head (Built-in Mathematica Symbol)

Head[expr] gives the head of expr.

Import and Export File Elements (Mathematica How To)

Sometimes you may want to work with a specific part of a file instead of all of it. When bringing a file into Mathematica , you can elect to import just individual parts of ...

An Example: Defining Your Own ... (Mathematica Tutorial)

Now that we have introduced the basic features of patterns in Mathematica, we can use them to give a more or less complete example. We will show how you could define your own ...

Save (Built-in Mathematica Symbol)

Save["filename", symbol] appends definitions associated with the specified symbol to a file. Save["filename", " form"] appends definitions associated with all symbols whose ...

Fold (Built-in Mathematica Symbol)

Fold[f, x, list] gives the last element of FoldList[f, x, list].

PolynomialQ (Built-in Mathematica Symbol)

PolynomialQ[expr, var] yields True if expr is a polynomial in var, and yields False otherwise. PolynomialQ[expr, {var_1, ...}] tests whether expr is a polynomial in the var_i.

Clip (Built-in Mathematica Symbol)

Clip[x] gives x clipped to be between -1 and +1. Clip[x, {min, max}] gives x for min <= x <= max, min for x < min and max for x > max. Clip[x, {min, max}, {v_min, v_max}] ...