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Computing mean by group (need help with speed!)
Hi everyone, I need to demean the columns of matrix Xw (200000 x 24) by group id. To do this, I need to compute means of the ...
10 years 前 | 6 个回答 | 1
6
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How does particle swarm deal with objective function evaluations to NaN?
Hi everyone, Simple question, though I haven't been able to find a definite answer: How does the Particle Swarm optimization ro...
10 years 前 | 1 个回答 | 0
1
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Help speeding up matrix algebra in loop...
Hi everyone, I'm simply looking for some suggestions for speeding up the following block of code: bhat = (X'*X)\(X'*y);...
10 years 前 | 1 个回答 | 0
1
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warning when solving nonlinear equations with 'solve'
Hi everyone, Quick question: I'm trying to solve a nonlinear system of 30 equations in 30 unknowns using the solve function, an...
11 years 前 | 1 个回答 | 0
1
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Creating symbolic function with certain properties but unspecified functional form?
I've written code to symbolically log-linearize a non-linear model, and would like to specify several symbolic functions general...
12 years 前 | 1 个回答 | 0
1
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New user, help please!!!
I keep getting this error using the mupad solver!! equations:={eqn1,eqn2,...,eqn51} unknowns:={var1,var2,...,var51} sol...
12 years 前 | 1 个回答 | 0
1
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"Illegal variable context [DOM_VAR]" using mupad solver
I'm trying to symbolically solve a system of 51 equations in 51 unknowns. My code looks as follows: equations:={eqn1,eqn2,......
12 years 前 | 0 个回答 | 0
0
个回答提问
simple fsolve problem...
I'm new to MATLAB and I'm trying to solve a nonlinear system of two (large) equations in two unknowns, but I keep getting the "T...
13 years 前 | 1 个回答 | 0
1
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One-dimensional array of variable length
I need to create a one-dimensional string array of _variable length_ that I can add elements to as needed. I don't know how lon...
14 years 前 | 3 个回答 | 0
3
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Converting string matrix from Excel to Matlab
I have an excel document containing a matrix of strings (that is, each cell contains a word of varying length). If possible, I ...
14 years 前 | 2 个回答 | 0
