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Fabio Freschi


Politecnico di Torino

Last seen: 3 días hace |  Con actividad desde 2014

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Programming Languages:
C++, C
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English

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Respondida
How to solve and plot second order differential equation using ode45?
In your code there is a mistake in the definition of x(1) and x(2) I have made a few stylistic changes (parameters outside the ...

16 días hace | 0

Respondida
exponential regression functions with error in input values
you can use lsqnonlin or lsqcurvefit clear variables, close all % data x = [4 25 100]; y = [100 50 0]; % fitting functi...

17 días hace | 0

Respondida
Runge-Kutta 4th order method for 2nd order differential equation with complex number
Your code is working correctly: in fact, if you use the built-in ode45 solver, you obtain exactly the same result. My guess ther...

17 días hace | 0

Respondida
stl write triangulation error.
There are two errors The output of surf2solid is not a triangulation object inputs of stlwrite are in the wrong order sidelen...

alrededor de 2 meses hace | 0

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Respondida
Conditional Question Matlab Disagreement
I agree with all the comments and answers. But maybe one should read (6+3)>8>2 as "is 8 larger than 2 and lower than (6+3)?" tha...

alrededor de 2 meses hace | 0

Respondida
How to convert 2d implicit plot to 3d plot?
For every value of c you have a different surface. So you can plot one surface at a time. For example % param value c = 0; ...

alrededor de 2 meses hace | 0

Respondida
How I can split a two column data into chunks like this snap shot
If I have understood correctly, this code should to the job. Note that 83 is a prime number, so it is difficult to create chunks...

alrededor de 2 meses hace | 0

Respondida
fprintf formatting problem with cell and array matrix 2
With mixed data tipes the simplest thing is to use a for loop clear, clc, close all %% input data fracs = ... [1.0807995...

alrededor de 2 meses hace | 1

Respondida
Related to comparing two vectors
You can compare the two complete vectors (you also compare zeros, but who cares?) % data v1 = [0 0 0 4 5 0 0 0].'; v2 = [0 0 ...

alrededor de 2 meses hace | 0

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Respondida
Show matrix is not invertible.
You can simply show that A is not full rank syms a b c d e f g h A = [a 0 0 b 0; 0 c 0 0 d; 0 0 e f 0; 0 0 0 0 g; 0 h 0 0 0] ...

alrededor de 2 meses hace | 0

Respondida
Visualize CFD data in a 2D mesh
I assume you have the connectivity of your cells, if not you can create it with delaunay. Then use the low level funciton patch....

alrededor de 2 meses hace | 1

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Respondida
Solving systems of equations graphically and finding where they cross.
@Matt J solution is the cleanest. I have understood you want to find the graphical intersection. If you want to do it yourself y...

alrededor de 2 meses hace | 0

Respondida
Finding sum of for loop with if else statement
You must move your sum inside the loop increment your summation variable Note that your vector is complex and plot displays o...

alrededor de 2 meses hace | 0

Respondida
Method to get as large and few as number boxes
The following attempt is far from being a perfect answer to your question. All perplexities of @Walter Roberson are also mine, s...

alrededor de 2 meses hace | 2

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Respondida
Converting MATLAB Isosurface into Triangulation object for .stl export
You don't need to use surf2patch. You can extract infos directly from the struct created by isosurface isosurf = isosurface(tif...

alrededor de 2 meses hace | 0

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Respondida
Issue connectivity faces with isosurface
Sorting of the faces does not guaratee the property you think exist. If you check, your isosurface is a closed surface: all edge...

alrededor de 2 meses hace | 0

Respondida
How to graph values of different lengths?
@Nicole, you initialize the vector EV_power to have length 24*60*7 = 10080, however in the two nested loops, the dimesion change...

alrededor de 2 meses hace | 0

Respondida
Problem fitting the curve with fminsearch
I would use lsqnonlin: it's more general than polyfit suggested by @Torsten (that in this case would work perfectly). Qualitativ...

2 meses hace | 1

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Respondida
Identify some nodes near a known node
You can use featureEdges. You get both upper and lower nodes, but it's not difficult to distinguish them You can also check for...

2 meses hace | 1

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Respondida
How do I start counting when below a threshold and stop counting above the same threshold in a timeseries?
Below you can find a possible solution that does not require any toolbox % signal length N = 100; % threshold t = 0.5; ...

2 meses hace | 0

Respondida
Creating a For Loop to Compare Every Two Cells in Array
I try to translate your pseudocode into Matlab instructions HD_Affect = ["Neutral" "Positive" "Negative" "Positive" "Neutral" "...

2 meses hace | 0

Respondida
delete the top and bottom triangular faces of the 3D object
By looking at your data I see that the top and bottom triangles have a predominant z direction of the face normals. So I play wi...

2 meses hace | 0

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Respondida
order the rows of the 3 matrices starting from the third coordinate of the point P
If you want to sort A according to the third column you can simply do the following % your data A = [28.0445 -17.2717 83.972 1...

2 meses hace | 0

Respondida
identify the coordinates of a point P (1x3) in three distinct matrices
You can use ismember % data A = [28.0445 -17.2717 83.972 1 2 3 27.8199 -16.986 83.3748 4 5 6 27.2756 -16.339 81.871 ...

2 meses hace | 1

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Respondida
Skin effect formulas with imaginary numbers problems
There are several problems in your script you forgot the empy space permeability you are misinterpretating the concept of comp...

2 meses hace | 2

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Respondida
Is it possible to programmatically get a list of all file dependencies included in my standalone application (Matlab Compiler )
Never used Matal Compiler, so I don't now if I'm of help. In any case I put my 50 cents in. When I want to extract all matlab f...

2 meses hace | 1

Respondida
How to write axes on an imported mesh
You can use quiver3. In the example below I plot the 3 coordinate axes, you can modify accoridng to your vectors clear variable...

2 meses hace | 0

Respondida
stl fusion of two files
While waiting for more details about the inputs, I make my guesses. if your objectSTL has nodes/faces/normals, you can't addres...

2 meses hace | 0

Respondida
How to make a nonperiodic signal periodic?
I had the same idea of @William Rose, here is a possible implementation clear variables, close all % anonymous function v...

3 meses hace | 3

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Pregunta


Calculate streamlines using ODE
Hi Matlab Gurus, I have read many posts in this forum about my problem but I'm still not capable to solve it. I'm trying with a...

9 meses hace | 1 respuesta | 0

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