command to create array and graph

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Hi guys,

I am preparing for exams, doing practice questions and want to know if the commands I am using for a question are correct.

Matrix 3 rows, 5 columns

Is the command to create this matrix

a = [16 456 22 85 93;11 78 310 62 36;1 66 23 67 405] ?

how would I graph the 3rd row or column? how can the grid of the graph be set to visable and the x and y axis to be included?

thank you :)

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Answer 1

Geoff Hayes 2016-5-1

1 个投票

Laura - yes, the command

a = [16 456 22 85 93;11 78 310 62 36;1 66 23 67 405]

will create the 3x5 matrix. To extract all of the elements of the third row, you can do

a(3,:)

and to access all the elements of the third column, you can do

a(:,3)

You can then plot this data however you want. See grid for displaying or hiding the axes grid lines.

Geoff Hayes 2016-5-1

Glad to have been able to help, Laura. As for turning on the grid lines, please see the documentation at grid. Labels for the x and y axes, see Add Title, Axis Labels, and Legend to a Graph.

Laura McHugh 2016-5-2

Thanks Geoff!!