M4: zyBook Activities Multiple Choice

Row Column Integer indexing

Can return a 2D array

Linear Integer indexing

Will always return a 1D Array

Indexing with a 2D Logical Array

Will always return a column array

linear indexing array

a special type of integer array that uses a single index to extract from a 2D array

indexing array

a special type of integer array used for indexing

integer indexing array

a special type of integer array used for indexing

integer array

an array of integers

indexed array

an array that is being accessed by an indexing array

With linear indexing, what is the integer index array to display the cMat(1,1) and the cMat(2,2) as a column? (cMat = [[10,20] ; [30,40]])

cMat([1;4])

With row-column indexing, what is the logical index array to display both the cMat(1,1) and the cMat(2,2) as a row? (cMat = [[10,20] ; [30,40]])

cMat([[true, false]; [false, true]])'

sampleMatrix([2:4]') (yields a what?)

column array (of indexes 2 through 4 in flattened sampleMatrix)

logical indexing must index all elements of an array

false

sampleMatrix([n])

flattens and removes a value from a matrix

sampleMatrix([n])=[]

flattens and removes a value from sampleMatrix

logical array

indexing with this array for a matrix yields a column; indexing with this array for a row array yields a row.

mat(n:m)=[]

removes elements n:m in an array (or removes elements n:m and flattens matrix)

x1=x2(:)

replaces x1 with a COLUMN array consisting of all the elements in x2

x2=x1(:)'

replaces x2 with a ROW array of all elements in x2

reshape(matrix, row, col)

reshapes the matrix

array(:)

returns column array of all elements in array

size(array, 2)

returns the column sizes

size(array)

returns the dimensions of an array

length(array)

returns the length of a 2D array

numel(array)

returns the number of values in an array

Linear indexing with a row array

will always return a row array