Smooth

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Dmitry
Dmitry 2012-2-22
编辑： Colin 2013-10-20
HELLO, I HAVE A QUESTION I have matrix, but the data is not good there, i need to use function Smooth. but when i try i get a problem every time. maybe someone has an exampl. how i can use smooth for matrix?
thanks
[SCd merged from Duplicate]
I have this task. we have a car with 15 elements in it. for each element i have a matrix of possible values. I need to use smooth for each matrix
Can you help me thanks

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回答（2 个）

Wayne King
Wayne King 2012-2-22
smooth operates a column vector, so you could loop over the columns of the matrix; I don't know how big your matrix is.
X = randn(100,100);
Y = zeros(size(X));
for nn = 1:100
Y(:,nn) = smooth(X(:,nn));
end
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Wayne King
Wayne King 2012-2-22
That doesn't give me the size of the matrix
Dmitry
Dmitry 2012-2-22
4 matrix
189x3
22x2
366x2
345x2

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Wayne King
Wayne King 2012-2-22
From the part Sean merged in, perhaps it doesn't make sense in your application to smooth the columns of the matrix separately. Maybe you want filter the entire matrix at once.
Here just using one possible lowpass filter.
h = [-0.0758 -0.0296 0.4976 0.8037 0.2979 -0.0992 -0.0126 0.0322]';
h = h*h';
X = randn(10,10);
Y = filter2(h,X);
basically you can use any number of lowpass FIR filters including a strict moving average filter. Again, without knowing your application, it's difficult to say which smoothing method is most appropriate.
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Dmitry
Dmitry 2012-2-22
exampl
73572e+05 64
73571e+05 73
Dmitry
Dmitry 2012-2-23
size -
189x3
22x2
366x2
345x2
data
73572e+05 64
73571e+05 73

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