John

Aktiv seit 2011

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Statistik

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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 ...

mehr als 10 Jahre vor | 6 Antworten | 1

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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...

mehr als 10 Jahre vor | 1 Antwort | 0

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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);...

mehr als 10 Jahre vor | 1 Antwort | 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...

mehr als 11 Jahre vor | 1 Antwort | 0

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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...

fast 12 Jahre vor | 1 Antwort | 0

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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...

mehr als 12 Jahre vor | 1 Antwort | 0

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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,......

mehr als 12 Jahre vor | 0 Antworten | 0

0

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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...

mehr als 13 Jahre vor | 1 Antwort | 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...

mehr als 14 Jahre vor | 3 Antworten | 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 ...

mehr als 14 Jahre vor | 2 Antworten | 0

2

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