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

DensityHistogram[{{x_1, y_1}, {x_2, y_2}, ...}] plots a density histogram of the values {x_i, y_i}.DensityHistogram[{{x_1, y_1}, {x_2, y_2}, ...}, bspec] plots a density ...

DiagonalMatrix[list] gives a matrix with the elements of list on the leading diagonal, and 0 elsewhere. DiagonalMatrix[list, k] gives a matrix with the elements of list on ...

The first argument given to DSolve is the differential equation, the second argument is the unknown function, and the last argument identifies the independent variable. Here ...

AtomQ[expr] yields True if expr is an expression which cannot be divided into subexpressions, and yields False otherwise.

MeanShift[list, d] replaces each element in list by the mean of the values of all elements that differ by less than d.

Re[z] gives the real part of the complex number z.

Mathematica creates a new symbol when you first enter a particular name. Sometimes it is useful to "intercept" the process of creating a new symbol. Mathematica provides ...

ChartElements is an option to charting functions such as BarChart that specifies the graphics to use as the basis for bars or other chart elements.