what is a vector in computing
An ordered arrangement of data items. A vector is a one dimensional array; a matrix is a two-dimensional array. Arrays are used in myriad applications from basic database processing to scientific simulation. Most programming languages support arrays by providing indexes into the data.
An array is a kind of aggregate data type. A single ordinary variable (a scalar) could be considered as a zero-dimensional array. A one-dimensional array is also known as a vector. A reference to an array element is written something like A[i,j,k] where A is the array name and i, j and k are the indices. The C language is peculiar in that each index is written in separate brackets, e.g. A[i][j][k].