For vector Grades=[98 56 78 34 100 88 87], delete the number 78 to get the following matrix
Grades=[98 56 34 100 88 87]
**remember you have to create the matrix first
This user (ALBERT ALEXANDER STONIER) appears to have gamed the system, with fraudulent "likes" of this unremarkable solution submitted by 'sock-puppet' accounts. —DIV
Swap the first and last columns
Find the sum of the elements in the "second" diagonal
Matrix indexing with two vectors of indices
Arrange vector in ascending order
Calculate the area of a triangle between three points
Vectors counting by 2
Replacing a row
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