The product of two matrices ,AB is defined. Then each column of AB is a linear combination of the columns of B using weights from the corresponding columns of A.
举一反三
- Let A be a [img=40x20]1803c4e60908a8b.png[/img]matrix, and the determinant of A is 0,then _________. A: there must be a column of elements in A that are all 0 B: there must be a column in A that is a linear combination of the other column vectors C: there must be two columns that are proportional to each other D: any column vector in A is a linear combination of the remaining column vectors
- 1.3 预订机票-词汇测试Match the words and their corresponding Chinese meaning from the two columns
- There exsist matrices A and B such that AB is defined and BA is defined, but[img=79x23]1803b6ad36d9535.png[/img].
- The columns of the standard matrix for a linear transformation from [img=22x19]1803b6a8c19a71a.png[/img]to [img=25x19]1803b6a8c9f3863.png[/img] are the images of the columns of the [img=44x19]1803b6a8d3fc1b1.png[/img] indentity matrix.
- If a is known to be a 2×3 matrix, then after executing a=a(:), ( ). A: a transforms to a column vector B: a transforms to 3 rows and 2 columns C: a transforms to 3 rows and 3 columns D: a transforms to 2 rows 3 and columns