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Sargondjani


Last seen: Today Active since 2012

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Answered
Please help me convert equation to matlab code
[0 0 0;1 2 3] is an example of a matrix i Matlab. Please try the rest yourself. We are not here to do your homework. If you gav...

etwa 2 Stunden ago | 0

Answered
Error in fmincon (line 568) initVals.f = feval(funfcn{3},X,varargin{:})
As the error says there is no function P_model_main. You also only provided coded with a function called P_model. And please don...

etwa 2 Stunden ago | 0

Answered
Changing color of plot
The problem is that you plot only 1 point at a time. So there is no line to plot, just a point. That's why your code doesn't wor...

etwa 2 Stunden ago | 0

Answered
How to evaluate parameters in sum() of handle functions with fminsearch
Take a look at this. I hope it helps. x_exp=rand(1,10); %just to define the known vectors y_exp=rand(1,10); n=3; g=rand(1,n)...

etwa 2 Stunden ago | 1

Answered
Plot the slope of a parabola with only the data points being known
clc; clear all; close all; x = linspace(-0.5,0.5,25); %length in (meters) def_3mm_no_grav = -[0.00 5.82e-1 1.08 1.53 1.94 ...

etwa 2 Stunden ago | 0

Answered
How do I plot if I have a lot of data on the x-axis and I want to see the whole line properly in app designer?
It is not clear what you mean with "How can I see all the lines correctly?" I'm sure the lines are correct, but your input is n...

etwa ein Monat ago | 0

Answered
I can't figure out how to define X in a piecewise function to create a Bending Moment Diagram
The script of your professor is actually the function. Save it and you can call the function. function handle: myfun = @(x)mom...

etwa ein Monat ago | 1

Answered
fsolve, fmincon producing different results
I believe fmincon could also be stuck in a local minimum, due to the quadratic terms. This solution might not actually solve the...

etwa ein Monat ago | 0

Answered
how to retrieve a table from a cell array?
NEver used table but i think this will work: X = results{1,2}{1,1}; MyDates = X.Date; Might even work directly: MyDates = ...

etwa ein Monat ago | 0

Answered
Issue with numerical integration of two variable function
You created only function handles. So f(x,y) = ..... To compute the numerical value you need to assign numerical values to x an...

etwa ein Monat ago | 0

Answered
Index in position 2 exceeds array bounds (must not exceed 2). Error in fun1 (line 5)
You calculate: for i=1:N for j=1:D pos(i,j)=lb(j)+rand*(ub(j)-lb(j)); end end with D= 2, so pos is a...

etwa ein Monat ago | 0

Answered
How to Solve matrix equations in Matlab
Your method seems valid. But of course fsolve will only attempt to find a local solution, and it might get stuck in a place wher...

etwa ein Monat ago | 1

Answered
Index exceeds the number of array elements
The argument in brackets should be an index number, so for example: x = 1:10; %a 1 x 10 vector for ix = 1:size(x,2); f(ix) = ...

etwa ein Monat ago | 0

| accepted

Answered
How to put fsolve in a loop, using 2 unknowns?
Replace the first line with: H = @(X)fsolve_root_finding(X(1),X(2));

4 Monate ago | 0

Answered
Need to apply trapezoidal rule for double integration with an array by using the for loop
There are two things that need correction: 1) Remove the line i=i+1. This is what the for loop does. (also don't use "i" in ge...

4 Monate ago | 0

Answered
Error in find Precision recall curve
Try without the quotations: [XCrit,tpr,YCrit,ppv] = perfcurve(Y,diffscore1,'HandGrip'); In general quotations are used to sp...

4 Monate ago | 0

| accepted

Answered
I am solving a nonlinear Model predictive control problem . I get the following error. Can anybody help me understand the error report?
The error says that the derivative at the initial point (x0) is either NaN, infinity, or complex. So you should check whether th...

4 Monate ago | 0

| accepted

Answered
time series interpolation of irregular data
You can use "griddedInterpolant". I would use 'pchip' as method.

4 Monate ago | 0

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...

7 Monate 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...

8 Monate 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...

8 Monate 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...

8 Monate 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...

8 Monate ago | 0

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

8 Monate 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...

8 Monate ago | 2 answers | 0

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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...

9 Monate 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...

9 Monate ago | 0 answers | 0

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Question


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

mehr als 2 Jahre ago | 0 answers | 0

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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...

mehr als 2 Jahre ago | 1 answer | 0

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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 ...

mehr als 2 Jahre ago | 0 answers | 0

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