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| linspace(first #,last #,# of #'s total) |
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x= 3 3 3
y= 1 1 1
x./y= 3 3 3
x.\y= .3 .3 .3 (rounded) |
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Matlab error
This is different from 5*a+b |
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x=[a,b,c]
y=[g;e;f] <--notice column vector
x*y=? |
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Definition
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function (something) = anotherthing(a,b)
something=a*b
anotherthing(2,4)=8 |
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Definition
adds all columns first
sum(sum(a)) will add all numbers up |
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plot(X,Y)
'g'=green
'gx' marks points with green x's and takes away connecting lines |
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| relational operators, these will give you true false results 1=true 0=false |
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repmat(number/numbers,M,N)
MxN matrix |
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Definition
ones(M,N)
MxN matrix of ones
ones(N)
NxN |
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Definition
| A=[1 2 3] %1x3 A'=[1;2;3] %3x1 |
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polyval([1,2,3],x)=
x^2+2x+3 |
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| designating certain parts of matrices |
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Definition
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Definition
global X
x=10
x= will be 10 |
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Definition
fplot(@func3(x),[0,10])
0 to 10 is the interval |
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Definition
used to approximate integrals
quadl is more accurate |
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Definition
trapz(t,a)
t and a are vectors (number strings)
integral of a with respect to t |
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Definition
[T,Y] = ode45(@func,[0,100],[0;.005])
T=Column vector time poins
Y=solution points
0 to 100 is the interval
and 0 and .005 are some initial points pertaining to the function |
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Definition
fzero finds roots nearest to a guess, x
IF AND ONLY IF THE FUNCTION IS CONTINUOUS
fzero('sin',x)
x=guess
'sin' just an example of a function |
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Definition
| 3D graph of Z surface height over x and y |
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Definition
meshgrid(x,y)
creates ordered pairs of two string of numbers x and y |
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| a is the vector starting the 2nd row of matrix be and going to the end. |
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eye(2)= 1 0
0 1
identity matrix |
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Definition
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[5 2]
starting#: count by: until # |
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v= [1 2 3]
v>=2 ?
v(v>=2) ? |
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Definition
v>=2 = [0 1 1]
v(v>=2) = [2 3] |
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Definition
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x=[1 2 3 4 5]
x(end:-2:end-4)
this is the same as x(end:-2:1) |
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Definition
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Definition
rand(m,n)
MxN matrix of random number up to 1 |
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find roots of x^3+2x^2
roots([1 2 0 0]) |
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