Built-in Mathematica Symbol

ConstantArray

ConstantArray[c, n]
generates a list of n copies of the element c.

ConstantArray[c, {n₁, n₂, ...}]
generates an

array of nested lists containing copies of the element c.

ConstantArray[c, n, SparseArray] gives the constant array as a SparseArray object.

Make a vector of 10 c's:

Make a 3×4 array of c's:

Make a vector of 10 c's:

Make a 3×4 array of c's:

A machine-zero vector:

A vector of exact zeros:

A machine-zero matrix:

A matrix of exact zeros:

A vector of ones:

A machine-number vector of ones:

A deeply nested constant array:

Set up an array to use as storage in a program:

Numerically solve x'[t]

1/(t+x[t]^2) using Euler's method:

Find the sum of the elements in a list:

This can also be done with Total:

Use a vector of ones to see the effects of conditioning on the solution of a linear system:

The solution at machine precision has significant errors:

At higher precision, the solution is much better:

ConstantArray[c, dims] is equal to SparseArray[{}, dims, c]:

Normal[s] is identical to ConstantArray[c, dims]:

ConstantArray[c, dims] is equivalent to Apply[Table[c, ##]&, Map[List, dims]]: