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54 Cards in this Set
- Front
- Back
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round()
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Round towards nearest integer
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fix()
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Round towards 0
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ceil()
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Round towards infinity
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floor()
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Round towards negative infinity
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nthroot(27,3)
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Roots 27 by 3
= 3 |
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rem(a,b)
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remainder of a/b
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mod(a,b)
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remainder of a/b taken into account (-/+) signs
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factor()
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returns any prime factors of 15
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x = input()
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x is assigned whatever value the user inputs
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~
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not
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xor()
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returns true (1) if exactly one of the values is true and the other is false
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'
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transposes rows to columns
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x = a:b:c
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creates a vector starting with a and ending with c with increments of b
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linspace()
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linspace(start, stop, #points)
spaces points evenly between the start and end of a number |
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ones(n)
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creates an n by n matrix of ones
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zeros(n)
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creates an n by n matrix of zeros
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eye(n)
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creates an n by n logical matrix
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rand(n)
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n by n matrix of random numbers from 0 to 1
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ceil(10*rand(n,m))
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creates an n by m matrix of whole numbers 1-10
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size(a)
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finds the number of rows and columns of matrix a and outputs a 2x2 vector containing (rows columns)
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a(n,m)
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accesses the value in row n, column m
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A([1 2 3],3)
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in A, rows 1, 2, and 3, column 3
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A(:, n)
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the entire column n
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A(n, :)
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the entire row n
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A([3 8])
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outputs the 3rd and 8th number in column order
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find(n)
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finds the INDEX of the numbers
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sum(m)
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sums up the vector in columns
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primes(n)
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all the primes from 1-n
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fliplr(n)
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flips the matrix n left and right
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flipud(n)
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flips the matrix n up and down
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sort()
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sorts each row from least to greatest
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sortrows(z,n)
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sorts the entire column of number n in matrix z and reorganizes the rest accordingly
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max(m)
max(max(m)) |
returns the maximum number in each column
returns the maximum number in the entire matrix |
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mean(a)
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returns the mean of each column
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meshgrid()
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takes two vectors as arguments and creates two matrices as its output that have opposing gradients
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v(n)
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returns the value of index n
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v(n) = a
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replaces the value in index n with a
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interp1(x1,y1,x2)
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estimates the y2 values based on x1 and y1, and graphs a linear function
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spline(x1,y1,x2)
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estimates y2 values based on x1 and y1, and graphs a curvy function
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polyfit()
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it takes the x and y points and makes a polynomial expression of them
coeffs = polyfit(x,y) -- x values & y values coeffs = 3 2 1 3x^2 + 2x + 1 |
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y_fit = polyval(coeffs, x_fix)
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produces the y values based on the polynomial coefficients and the x values (i.e. x_fit = 1:.1:10)
and use that to plot the function |
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Z = trapz(x,y)
x = a:n:b y = x^2 |
finds the integral of the function y from a to b
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quad(y,a,b)
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integrates y from a to b
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strcmp()
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compares 2 strings, case sensitive
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strcmpi()
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compares 2 strings, case Insensitive
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int2str()
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converts integer to string
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num2str()
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converts numbers to string including decimals
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regexp()
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matches a pattern, case sensitive
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regexpi()
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matches a pattern, case insensitive
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regexprep()
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replaces a pattern with something else
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'match'
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outputs the text of each match
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*
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matches zero or more occurrences
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+
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matches one or more occurrences
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regexprep(y,'den(\w*)','peter$1')
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substitutes den with peter
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