Page 33 - Basics of MATLAB and Beyond
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To raise the elements of a matrix to a power use the .^ operator:
>> a = pascal(3)
a =
1 1 1
1 2 3
1 3 6
>> a.^2
ans =
1 1 1
1 4 9
1 9 36
6 Basic Data Analysis
The following functions can be used to perform data analysis functions:
max maximum
min minimum
find find indices of nonzero elements
mean average or mean
median median
std standard deviation
sort sort in ascending order
sortrows sort rows in ascending order
sum sum of elements
prod product of elements
diff difference between elements
trapz trapezoidal integration
cumsum cumulative sum
cumprod cumulative product
cumtrapz cumulative trapezoidal integration
As we have seen with the plot command, matlab usually prefers to
work with matrix columns, rather than rows. This is true for many of
matlab’s functions, which work on columns when given matrix argu-
ments. For example:
>> a = magic(3)
a =
8 1 6
3 5 7
4 9 2
>> m = max(a)
m =
8 9 7
c 2000 by CRC Press LLC
