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Unformatted text preview: Ch7: Data analysis 7.1 max and min • max(x) Returns largest value in vector x, or the row vector of largest elements of each column in matrix x • [y,k] = max(x)  Returns maximum values y and corresponding indices k of the first maximum value from each column of x. • max(x,y) Returns a matrix the same size as x and y, with each element being the maximum value from the corresponding positions in x and y. • min(x) Returns smallest value in vector x, or the row vector of smallest elements of each column in matrix x • [y,k] = min(x)  Returns minimum values y and corresponding indices k of first minimum value from each column of x. • min(x,y)  Returns matrix the same size as x and y, with each element being the minimum value from the corresponding positions in x and y. 7.2 sums and products • sum(x)Returns the sum of the elements in vector x, or the row vector of the sum of elements of each column in matrix x • prod(x)Returns the product of the elements in vector x, or the row vector of the product of elements of each column in matrix x • cumsum(x) Returns a vector the same size as x containing the cumulative sum of the elements in vector x, or a matrix the same size as x containing cumulative sums of values from the columns of x. • cumprod(x) Returns a vector the same size as x containing the cumulative product of the elements in vector x, or a matrix the same size as x containing cumulative products of values from the columns of x. 7.3 Statistical analysis • N = hist(x)Returns the row vector histogram N of the values in x using 10 bins. If x is matrix, returns a histogram matrix N operating on the columns of x. • N = hist(x,m)Returns the row vector histogram N of the values in x using m bins. • N = hist(x,xc)Returns the row vector histogram N of the values in x using bin centers specified by xc. • N = histc(x,edges)Counts the number of values in vector x that fall between the elements in the edges vector (which must contain monotonically nondecreasing values). N is a length(edges) vector containing these counts. N(k) will count the value x(i) if edges(k) >= x(i) > edges(k+1). The last bin will count any values of x that match edges(end). Values outside the values in edges are not counted. Use inf and inf in edges to include all nonNaN values. • [N,xc] = hist(...) hist (...) Also returns the position of the bin centers in xc. Without output arguments produces a histogram bar plot of the results. • mean(x)Returns sample mean of the elements of the vector x. Return a row vector of the sample means of the columns of matrix x. • median(x)Returns the median of the elements of the vector x Returns a row vector of the medians of the columns of matrix x....
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 Spring '08
 Largerstrom
 Linear Algebra, Dot Product, Row vector, Complex number

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