i would reshape or construire matrice from [row,col]. i have row and col and i need matrice of my pixel

i would reshape or construire matrice from [row,col].

 i have row and col and  i need  matrice  of my pixel *bold*

[KSSV]

Question not clear....is it that you have a matrix I of pixels, and you want pixel value at given row and col? Then us I(row,col)

[Image Analyst]

Do you have an N by 3 list of [row, columns, grayLevel]? And you need to assign them to an array? Have you read this?