Comparison of small function and r in MATLAB

Http://www.cnblogs.com/wentingtu/archive/2012/03/30/2425582.htmlR function more Complete blog

Seeking redundancy

y = 5;  x = 2; y%%x = 1;

MATLAB mod (y,x);

R y%%x;

Number of rows to fetch

Matlab size (m,1);

R Nrow (m);

Repeating matrix

1 2 3->1 2 3 1 2 3

Matlab Repmat (m,i,j) repeats I times by row, repeating J times by column. Use Repmat (m,1,2) as above

If you want to reach 1 2 3

1 2 3 effect with Repmat (m,2,1)

R Rep (m,2) repeats by column

Merging matrices

M1= 1 2 3 m2=4 5 6 m=1 2 3 4 5 6

Horizontal Merge

R Cbind (M1,M2);

matlab [M1,M2];

Merge vertically

R Rbind (M1, M2)

MATLAB [M1 m2];

No back-up random sampling

m, for the whole. Num is the number of samples to extract

Matlab randsample (m,num); Returns a k-by-1 vector y of values sampled uniformly at random, without replacement, from the Integers 1 to n.

R sample (M,num,replace=false); False means not to put back the sample, true to put back the sample

Creating a special matrix

R Mat.or.vec (i, J) I row J column all 0 matrices

MATLAB Zeros (I,J)

SSE = Matrix (data, I, J,byrow = TRUE) I row J column, where the data is data, arranged by rows

Find vector length

v = 1 2 3

R Length (v) =3

Matlab Length (v) =3

Multiply matrix corresponding elements

M1=1 2 3 m2= 4 5 6 m = 4 10 18

Matlab m1.*m2;

R m1*m2;

Normal multiplication of matrices

Matlab m1*m2

R m1%*%m2

Find standard deviation of sample

R SD (v)

MATLAB STD (v)

Find the lowest value subscript (usually take a vector, and then ask)

x = 5 2 1 4 10

R which.min (x) = 3

MATLAB find (x = = min (x))

Find the subscript where the specified element is located and reject

index= find (Matrix = = num) index holds the subscript for NUM, subscript is computed by column, and the second column is counted after one column

index = (vector > num) is larger than Num's subscript takes 1, the other takes 0, which is generally picked out and then used for culling

Vector (index) = []; exclude the element where index is located

Remove vector Specifies the value of the underlying

x = 5 8 10 11 12

R X[-1] = 8 10 11 12

Matlab x (1) =[]

Take the nearest number from 0

x = 1.7 y=-1.7

R As.integer (x) 1 As.integer (y) =-1

fix for MATLAB (x) fix (y)

Comparison of small function and r in MATLAB