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# Sargondjani

Last seen: 3 days ago Active since 2012

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Add x=y line to the scatter plot
x = linspace(300,600,2); y = x; plot(x,y) And you will need a hold command after the scatter command.

28 days ago | 0

Find the difference between two numbers in an array and create a new array
d_theta=diff(theta);

28 days ago | 0

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Discretise a domain into a grid of uniform volume size
Why is linspace not helpful? x1 = linspace(0,1,M); x2 = linspace(0,1,M); [X1,X2] = ndgrid(x1,x2);

28 days ago | 0

Question

Scientific description of cubic spline (interpolation)
Dear all, I am writing a scientific article (quantitative economics), and I need to describe the 'spline' method (cubic spline ...

28 days ago | 0 answers | 0

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how can i save the even index to a matrix 2:5 using for loop
I think you want something like this: (which you could speed up by pre-allocating MAT=NaN(2,5)) cnt_rows = 0; cnt_cols = 0;...

1 month ago | 1

Question

mldivide versus least squares: X\(eye(m)) versus ( (X'X)\eye(m))*X'
Dear all, I am fitting a polynomial to data. I construct a polynomial basis X. I use some algorithm to update Y. I could use t...

1 month ago | 1 answer | 0

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[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...

1 month ago | 0

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...

1 month ago | 2

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...

1 month ago | 0

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)...

1 month ago | 1

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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 ...

1 month ago | 0

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...

3 months ago | 0

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...

3 months ago | 1

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...

3 months ago | 0

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 = ...

3 months ago | 0

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...

3 months ago | 0

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...

3 months ago | 0

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...

3 months ago | 1

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) = ...

3 months ago | 0

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

6 months ago | 0

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...

6 months ago | 0

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...

6 months ago | 0

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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...

6 months ago | 0

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

6 months ago | 0

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...

8 months ago | 0

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...

9 months ago | 1

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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...

9 months ago | 0

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...

9 months ago | 0