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#import int main (int argc, const char * argv[]) {@autoreleasepool {Variable groups inherit immutable groups1. Create a set number of elementsNsmutablearray *mutarr=[nsmutablearray Arraywithcapacity:7];2. Add an element to the arrayNsarray *[email protected][@ "MON", @ "TUE", @ "WED", @ "THU", @ "FRI", @ "SAT", @ "SUN"];Nsmutablearray *mutarray=[nsmutablearray Arraywitharray:arr];[Mutarray addobject:@ "EIG"];3. Insert the element according to the spec

The Python operation can find the pixel point in an image. For example, a white pixel with black pixels will be found. import cv2.cv as cv # load imagefilename = ".. /Video/cat.jpg "image = cv. loadImage (filename) # create one windowwin_name = "test" cv. namedWindow (win_name) win2_name = "test2" cv. namedWindow (win2_name) cv. showImage (win2_name, image) # set created imagesize = cv. getSize (image) # (100,100) depth = 8 channels = 1 # gray operategrey = cv. createImage (size, depth, channels

[Mathematical model] python Implementation of principal component analysis Def pca (dataMat, topNfeat = 9999999): # data matrix. The top feat meanVals = mean (dataMat, axis = 0) is output) # calculate the average meanRemoved = dataMat-meanVals covMat = cov (meanRemoved, rowvar = 0) # Calculate the covariance matrix eigVals, eigVects = linalg. eig (mat (covMat) # feature value, eigValInd = argsort (eigVals) # Sort To find the largest feature value. in

-meanvals3) find out the covariance matrix of the Matrix after averaging>>> Covmat=np.cov (meanremove, rowvar=0)4) the eigenvalues and eigenvectors of the covariance matrix are obtained, and the Eig function in the NumPy library is Used.>>> Eigvals,eigvects=np.linalg.eig (np.mat (covmat))>>> eigvalsArray ([1.20374494e+01, 3.44539806e+00, 1.01715252e+00,-1.59662646e-16, 1.21625562e-16])>>> eigvectsMatrix ([[[0.20502268, 0.21893499,-0.80686681, 0.450186

function [V,s,e]=princa (x) [M,n]=size (x); The% calculates the row m and column n% of the matrix-------------the first step: the normalized matrix-----------------%mv=mean (X); % calculates the mean value of each variable st=std (X); % calculates the standard deviation of each variable x= (X-repmat (mv,m,1))./repmat (st,m,1); % normalized matrix x-------------Second step: Calculate the correlation coefficient matrix-----------------percent r1=x ' *x/(m-1); % method One: Covariance matrix calcul

The next problem is that when the model is symmetric, the result is expected, but when the model is asymmetrical, the result is wrong, as follows:Input: Vertex: 233Output:What the hell is this? , Where's my horse!!!There seems to be a logical error.Note that the debug information for the C + + output is as follows:The error message is: Input to EIG must not contain NaN, then a bunch of hot hot ...There is also a hint: Matrix is close to singular or ba

product of all elements Methods for arrays of Boolean types#True直接当1计算In [24]: (arr2dSort Np.sort () This will copy a copy. Arr2d.sort () is the operation on the source data 5. Input and output for array filesTo save an array to disk in binary form Np.save () Np.load () accessing text files Np.loadtext () Np.savetext () 6. Linear algebra is not found when the Numpy.linalg Note: Transpose arr. T Np.dot (ARR1,ARR2) The produc

(X) print (pca.explained_ Variance_ratio_) Test and test with a dataset of your own makingThe program extracts a characteristic value to reduce the dimensionality of two-dimensional data Using PCA algorithm to reduce dimension of testSet.txt data set Import NumPy as NP import Matplotlib.pyplot as Plt def loaddataset (filename, delim= ' \ t '): FR = open (filename) S Tringarr = [Line.strip (). Split (Delim) for line in Fr.readlines ()] Datarr = [Map (float, line) for line in Stringarr] Ret

converted to C + + code, and the command line parameters are as follows:Generate C File: Mcc–t–l C x.mGenerate C + + files: mcc–t–l Cpp x.mGenerate dynamic link library functions: mcc–t–w lib:y–t link.lib x.m (Y for generated link file name)4. To import a link library: #pragma comment (lib, "libmatlb.lib") #pragma comment (lib, "libmx.lib") #pragma comment (lib, "libmatpm.lib")　　// c++ maths library 5. The reference code is as follows: double d[] = { 1, 2, 3, 4 }; mwArray A(2, 2, d); mwArray

(i,i)) * sqrt (d (j,j))) ; End end% calculates eigenvalue eigenvectors [eigvectors,eigvalues] = Eig (L); % selected before K maximum eigenvalue [eigvalues, Ind] = sort (diag (eigvalues), ' descend '); Neigvec =eigvectors (:, Ind (1:K)); % constructs a normalized matrix U from the obtained eigenvector U=zeros (size (neigvec,1), k); For I=1:size (neigvec,1) n = sqrt (sum (Neigvec (i,:). ^2)); U (i,:) = Neigvec (i,:). N End End Functio

Linear Equations np. linalg. eig (a) # feature Decomposition "Automatic" Reshaping a = np.arange(30)a.shape = 2,-1,3a.shape # (2L, 5L, 3L)print(a)array([[[ 0, 1, 2], [ 3, 4, 5], [ 6, 7, 8], [ 9, 10, 11], [12, 13, 14]], [[15, 16, 17], [18, 19, 20], [21, 22, 23], [24, 25, 26], [27, 28, 29]]]) X = np. arange (0, 10, 2) y = np. arange (5) m = np. vstack ([x, y]) Output: array ([[0, 2, 4, 6, 8], [0, 1, 2, 3, 4]) n = np. hstack ([x, y]) Output: ar

'))); % ===================================================== ======================================= figure ('name ', 'visualisation of covariance matrix '); imagesc (covar ); % ===================================================== ========================================= k = 0; % Set k accordingly egis = eig (covar) egis = sort (egis, 'descend') for I = 1: size (covar, 1) if (sum (egis (1: i)/sum (egis)> 0.99) k = I break; end % ==================

eig/EfM4mPp3scuH7ZU/OKkZsQEaesj1hZJ+ZMFzdSiFSvVaIJtuQQJAH3sXQ3DV EoeSW40TyYviq2K1pEpz9fGcS1TrjI+Yt1Mf0mvO6eupNZCfuhiAqJ5ZGRzTv1Pu G7pgz+ey5sWBcA==";var public_key = @"MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCRh7vKq7r6EhSg9y6iD38Vy08z umEJXhNTIGe8vRjdpE118Nu1cPRZ0AU9FbMIx8cnQtgCqGgW3DPDLj4VmlmdnJ8P cFHBBWgh85P1hicv8BQ0nLLjqezaBcS9EmO1C7zhdONVrvMFyHc1j76e+Fv+XfC6 CRvwKfqX+j5OMmWtowIDAQAB";var rsa = new RSACryptoServiceProvider();rsa.FromX5