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Questions related from Wei Xin
For any real symmetric matrix X and Q with the appropriate dimension, does the following inequality relation holds? λmin(Q) ‖X‖2 ≤ X^TQX ≤ λmax(Q) ‖X‖2 where λmin(Q) and λmax(Q) represent the...
17 October 2023 9,602 3 View
Hello, I have a question about ln(1-(tanh(x))^2). My calculation process is shown in the image below. However, the answer (in blue font) is different from mine, and I don’t know where I went...
22 August 2023 3,156 16 View
Given: x = 10sin(0.2t), y = 10cos(0.2t), z = 2.5sin(0.2t) (1) There exists the following mathematical relationship: u = x'cos(z) + y'sin(z), v = -x'sin(z) + y'cos(z),...
07 June 2023 3,465 5 View
Why is the matrix P in Eq. 9 positive definite when condition 1 is satisfied? （See picture for details.） （concurrent learning，Persistently Exciting ）
05 May 2023 1,972 3 View
In the field of reinforcement learning based optimal control, why the authors choose the multiple polynomials with even orders as critic neural network basis functions for simulation? For example:...
20 October 2022 4,861 7 View
