CMPSC 201 Fall 2024 Lecture 22 PDF

CMPSC 201- Fall 2024 Lecture 22 November 13, 2024  Diary Command  Allows you create a list of the commands (both good and bad) and recorded in a file.  Start a diary by typing diary on or just diary and a file name if you want.  End the recording by typing diary off...

CMPSC 201- Fall 2024 Lecture 22 November 13, 2024  Diary Command  Allows you create a list of the commands (both good and bad) and recorded in a file.  Start a diary by typing diary on or just diary and a file name if you want.  End the recording by typing diary off.  MATLAB Script File  List of commands to complete a task that you can run over and over.  What you will need to submit as for an assignment.  For an assignment: Start with your name and section number and the commands clc and clear. Next write introductory comments for each problem in the assignment immediately before each problem specifying description, input, output, and processing. Follow with the commands to solve the problem.  2-D arrays  Can create 2-D arrays by using the semicolon to separate the rows.  Can combine existent row vectors.  Accessing Elements in an Array  In MATLAB, the indices (subscripts) are enclosed in parentheses.  To access a specific element of a one-dimensional array (either a row or column vector) use the array name and the index (subscript) of the element of interest in parentheses.  Can also access multiple elements using the colon operator to create a list of indices (subscripts) or hard code the list of indices (subscripts) to be used. lengths(2:7) – for lengths 2 through 7 lengths([2 5 1 8]) –for those 4 elements (note is does not need to be in ascending order)  Indices Out of Range  If you try display or to use an index that is out of range, then you will get an error message.  However, you can expand the current size by using an assignment operator. Given the array amps = [3,11.3 6.7 9.1 45] The command x = amps(10) will generate an error The command amps(10) = 99 will change the row vector to [3,11.3 6.7 9.1 45 0 0 0 0 99]  Accessing Elements in 2-D Array  For a single element, enclose the row index and the column index in parentheses separated by a comma. arrayname(rowindex, columnindex)  Can access multiple elements by specifying row and column indices. arrayname(1:4,6) arrayname(4,[5 1 6]) arrayname(4:2, 1:5) Questions ???