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Sargondjani


Last seen: 2 days ago
105 total contributions since 2012

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Answered
Multiple sample values into scatteredInterpolant
What works is: Make a 3D array from B, so: for ih=1:length(B) B_3D(:,:,id) = B{ib) end And then add a vector 'h...

5 days ago | 0

Answered
x undefined (Catenary Cable Case Study)
What you have done is programmed a function. So this function calculates fval when you give a value of x. You can now call this...

1 month ago | 1

| accepted

Answered
Locating point on x-axis where the slope is decreasing
Bascially you want to get the index when the change in theta becomes negative: dtheta = diff(theta); index = find(dtheta<0,1...

1 month ago | 0

Answered
Conversion to logical from sym is not possible.
g = 3; eff1=@(rr)-(1.8-0.8.*(1+rr)./(1-7.56.*g*rr))*rr/(0.01-0.11.*rr+0.06.*exp(23*rr)); x=fminbnd(eff1,-1,1); You could s...

1 month ago | 0

Answered
Hourly averages over a 20yr time series
Its not exactly clear over which values you want to calculate the mean, but have a look at this function, that can calculate mov...

1 month ago | 0

Answered
Removing/clearing NaN/0 values from matrix/array data
A1 = A(A~=0 & B~=0) should work

1 month ago | 0

Question


1 iteration in fsolve: new x and no more
I want to use fsolve to only use one iteration: get the Jacobian, get x1 and done. However when test the code below, which tries...

1 month ago | 2 answers | 0

2

answers

Answered
Optimization of system ODE
It is still not clear what your problem is. Do you get an error? Do you get a different solution than you expected? Anyway f...

3 months ago | 1

Question


Why is EACH function evaluation inside a parfor loop much faster then ONE evaluation outside the loop?
Basically I calculate a finite difference Jacobian of a function, as shown below. The function evaluation labelled SINGLE RUN t...

3 months ago | 0 answers | 0

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answers

Question


Second Order optimality fmincon
Someone explained the second order condition for optimality of a constrained optimization problem here: https://math.stackexch...

2 years ago | 0 answers | 0

0

answers

Question


Incorrect solution for symmetric problems in fmincon
If I maximize XX(1)^2+XX(2)^2 subject to x1 + x2 <=1 and use starting value X0=[0.5,0.5] I get as solution X=[0.5,0.5], although...

2 years ago | 1 answer | 0

1

answer

Question


patternsearch with nonlinear equality constraint: any advice for more efficient steps?
Dear all, I have a constrained optimization problem which is not differentiable (because of some random errors), but it should ...

2 years ago | 0 answers | 0

0

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Answered
How to normalize curves with multiple peaks such that each peak will be 1 and each valley will be 0?
Yeah, you would have to calculate a scaling factor for each peak/trough. In one dimension you can then use the scaling factor fo...

2 years ago | 0

Answered
Tangent at a given point to a nonlinear curve
I think you need to be a bit more precise in what you want: you have data with errors in them, and you want to fit a curve that ...

2 years ago | 0

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Answered
Matlab R2014A blurry on high-dpi windows device
Two things did it for me: 1. go to matlab/bin and right click application, choose compatibility and check "disable scaling on h...

5 years ago | 0

Answered
fmincon and exitflag = -2 or 2 / non respect of constrained conditions
getting exit message 2 is not bad but if you insist on having 1, you could try to use smaller values for TolX (ie.. 1e-10 or eve...

6 years ago | 0

| accepted

Answered
Why does the first value in loop get overwritten
Thanks guys... normally i never save iteration variables like 'fi' but in this case the files contained "fi = 1". very silly

8 years ago | 0

Question


Why does the first value in loop get overwritten
For some reason when fi == 1, NPV_list(1,1) is inserted correctly, but when fi=2 the value gets overwritten, which i dont unders...

8 years ago | 3 answers | 0

3

answers

Answered
Vectorize sum of discount rates
thank you all for you answers... all did what i wanted, but the one by Matt Fig is the most simple

8 years ago | 0

Question


Vectorize sum of discount rates
Hi, I want to vectorize the calculation of series like this: [R^0;R^0+R^1;R^0+R^1+R^2;...etc. Im quite sure this should b...

8 years ago | 4 answers | 0

4

answers

Answered
sum elements of matrix if...
It seems i can not edit my comment... so here again (sorry for mess, but i forgot to 'code' my code) Ok, i was not clear let ...

8 years ago | 0

Question


sum elements of matrix if...
Hi, lets say i have two matrices: A=rand(5,10); B=[ones(1,10);3*ones(1,10);ones(1,10);ones(1,10);3*ones(1,10)]; I...

8 years ago | 2 answers | 0

2

answers

Answered
fixed-point iteration for root finding
a while loop might be a good idea: err_lim = 1e-6; x_new = %initial guess err = err_lim *2; %arbitrary to pass while ...

8 years ago | 0

Answered
how to solve a system of equations with n equation and m unknown (m>n)?
i think fmincon (constrained optimization) will work best... if you try to minimize some error use as the objective: objective=e...

8 years ago | 0

Answered
How to stop nonlinear fitting and obtain the results of fitting at that iteration
the display iter only displays something after an iteration is complete (after all function evaluations of that iteration are do...

8 years ago | 0

Answered
How to stop nonlinear fitting and obtain the results of fitting at that iteration
im no expert on this (sorry) but did you try the 'output' function thingy... i know for most optimizers there is such a thing. i...

8 years ago | 0

Answered
what is the optimal way to build a sparse matrix from row/col index, and value data?
did you check 'sparse'? i think this will do what you want: S = sparse(i,j,s) where i,j,s are your 3 column vectors... htt...

8 years ago | 0

| accepted

Answered
Optimization: Which algorithms I should choose when it's difficult to define an objective function?
...and if your problem is continuous, then the other optimizers are more usefull (fminsearch, fminunc, fsolve, fmincon,...). ...

8 years ago | 0

Answered
how can i remove this error in matlab?
ermm, what error? and what do you actually want the line to achieve? i mean, the code wants to assign a matrix with blanks to co...

8 years ago | 0

Question


Problem using 'deal' for objective and gradient in comb. with 'DerivativeCheck'
When using optimization tools I usually keep my objective function and gradient function as separate subfunctions and then use '...

9 years ago | 1 answer | 0

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