The line : help cname in Matlab gives a detailed information about the command cname.

Matrix functions - numerical linear algebra.

norm - Matrix or vector norm.

rank - Matrix rank.

det - Determinant.

null - Null space.

Linear equations.

\ and / - Linear equation solution; use "help slash".

inv - Matrix inverse.

cond - Condition number with respect to inversion.

condest - 1-norm condition number estimate.

chol - Cholesky factorization.

lu - LU factorization.

qr - Orthogonal-triangular decomposition.

 Eigenvalues .

eig - Eigenvalues and eigenvectors.

eigs - A few eigenvalues.

poly - Characteristic polynomial.

hess - Hessenberg form.

 eps - Floating point relative accuracy. 

zeros - Zeros array.

eye - Identity matrix.

rand - Uniformly distributed random numbers.

size - Size of matrix.

disp - Display matrix or text.

spy - Visualize sparsity pattern.

Matrix manipulation.

diag - Diagonal matrices and diagonals of matrix.

: - Regularly spaced vector and index into matrix.

spdiags - Sparse matrix formed from diagonals.

full to sparse conversion.

sparse - Create sparse matrix.

full - Convert sparse matrix to full matrix.

find - Find indices of nonzero elements

nnz - Number of nonzero matrix elements.