Answer1215

摘要： t=[0:0.01:0.98]; y1 = sin(2*pi*4*t); plot(t, y1) If you draw tha cos function, it will replace the sin function figure to a new one y2 = cos(2*pi*4*t) 阅读全文

摘要： When working in a codebase that has frontend, backend, middleware, service, and other concerns all in the same GIT repository, it can be helpful to co 阅读全文

摘要： Search for "Polacode" in extensions and install it: After installer, open "Command palette" Type "polocode". Use mouse to select code you want to crea 阅读全文

摘要： _.omitBy and its sibling _.pickBy are popular utilities which apply filter-like functionality to objects. Both of them accept a function to determine 阅读全文

摘要： Mutiplate materix: Everytime you see '.' mean element wise operator. >> A = [1 2; 3 4; 5 6]; >> B = [11 12; 13 14; 15 16]; >> C = [1 1; 2 2]; >> A*C a 阅读全文

摘要： Load data: load featuresX.dat who: Check how many variables in your current session: who whos: details about variables: whos Clear one variable: clear 阅读全文

摘要： You can do baisc math: 5+6 32-8 1/2 2^3 1 == 2 % ans = 0 means false 1 ~=1 % 1 not equals to 2. ans = 1 means true 1 && 0 1 || 0 xor(1, 0) Change the 阅读全文

摘要： 0 mertix doesn't have inverse. Only square materix (mxm) has inverse Tanspose: % Initialize matrix A A = [1,2,0;0,5,6;7,0,9] % Transpose A A_trans = A 阅读全文

摘要： The whole idea is to conver matrix-matrix multiplication to matrix-vector multiplication. Not commutative: Identity matrix: % Initialize random matric 阅读全文

摘要： For example the predicting house pirces example, we can code it in one line for materix vector multiplication. The tip is conver size to a m*2 matrix, 阅读全文