Mariano
Universidad de Oviedo
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Preconditioning in fmincon
I have a similar question. I am using fmincon with the algorithm trust-region-reflective and the option HessianMultiplyFcn, so ...
22 days ago | 0
Question
Strange behaviour of plot
When I do the following plot in R2025a, I do not see the line. (Here the code runs under R2024b) plot([0,eps,1],[0,eps,1])
5 months ago | 2 answers | 0
2
answersQuestion
Memory usage of decomposition
Hello, Consider linear systems Ax=b_i with A sparse and positive definite and several right hand sides b_i. In the experiments ...
8 months ago | 1 answer | 0
1
answerQuestion
Use sendmail with Reply To
Hello, I want to add a "Reply To" field in an email sent with Matlab's sendmail. I have tried setpref('Internet','Reply_To','m...
3 years ago | 2 answers | 0
2
answersQuestion
Where do all these digits come from?
Hello I know Matlab stores 52 bits which roughly means 16 decimal places. But if I ask for 40 digits of pi, I get 40 digits, th...
5 years ago | 1 answer | 0
1
answerA doubt regarding a simple For loop indexing for certain rows only.
a = [1 2 3 4 % start point A 1 2 4 5 % delete 1 2 4 5 % delete 1 2 4 5 % delete 1 ...
6 years ago | 1
Numerical integration: quadgk vs integral
Thanks a lot for your answers. They have been very helpful. Best wishes, Mariano
6 years ago | 0
Question
deval and fplot give strange warnings
Hello, I have found the following strange behaviour: 1) First, I solve an initial value problem for an ode numericall (say, w...
6 years ago | 0 answers | 0
0
answersStrange (lack of) round-off error using norm
I should have said version and computer: R2018b on Windows 64bits.
6 years ago | 0
Question
Strange (lack of) round-off error using norm
Hello, I have found this behaviour: >> format hex >> p=[sqrt(2) sqrt(2)]*1e3; >> sqrt(sum(p.^2)) ans = 409f400000000001...
6 years ago | 1 answer | 0
1
answerI do not like this
Thanks for your answer. I know what I am getting. It is the same I got before with kron when I wanted it. For me .* had always...
7 years ago | 0
Question
I do not like this
>> [1 2].*[1;2] ans = 1 2 2 4 I prefer the error message!
7 years ago | 1 answer | 0
1
answerQuestion
Numerical integration: quadgk vs integral
Hello: I have not been able to find out what is the underlying quadrature formula in Matlab's builtin function integral. I thi...
10 years ago | 2 answers | 2
