CMPSC 200 Lecture 04 Outline.pdf

CMPSC 200 Lecture 04 Outline.pdf - Sottile CMPSC 200...

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Sottile CMPSC 200 Programming for Engineers with MATLAB Lecture 04 Outline Related Reading: Chapter 3, §3.5 through §3.9. Array Operations Cont’d 1) Transpose: x' or transpose(x) (more on this idea in a few weeks) Built-in MATLAB Functions – Part II 1) Averages (read help / doc pages for “overloading” details) a. Mean: mean(x) (if x is a matrix, returns row vector of means from each col.) b. Median median(x) (“… median…”) c. Mode: mode(x) (“…mode…”) 2) Sums and Products (if x is a matrix, returns a vector of ___’s from each column) 3) Sorting a. Sort: sort(x) (if x is a matrix, sorts elements from each column). Useful option: sort(x,'descend') b. Sort Rows (sorts the rows in a matrix in ascending order on the basis of the elements on the first column, keeping the row intact: sortrows(x) . Useful option: sortrows(x,n) (selects from values in column n ) 4) Sizing a. Size: i. size(x) (returns the number of rows and columns in x ) ii. [a,b] = size(x)
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