# Valeria Leto

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**Content Feed**

Question

how to get the same contrast in an image?

Hi! I have image o.png which shows a difference in the contrast of the pixels, there is like a "line" that divide two different ...

1 day ago | 0 answers | 0

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answersQuestion

surf command doesn't plot the value next to NaNs values

Hi! I don't understand why the surf command doesn't plot the value next to NaNs values in the matrix M_array. For example the se...

4 days ago | 2 answers | 0

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answersQuestion

why does the surf command give me this result?

Hi! I got this image with surf(est,nord,down,I_frame,'EdgeColor','none') where (est,nord) are not regular points. I know for ...

10 days ago | 2 answers | 0

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answerswarning message using surf

@KSSV I can't load the matrix because the files are too big even in a .zip format

21 days ago | 0

Question

I don't understand how to link the higher level controller of a WIP

Hi! I am trying to simulate a wheeled inverted pendulum with a partial feedback linearization law. I would like to control its v...

2 months ago | 0 answers | 0

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answersQuestion

warning message using surf

Hi! I get this warning message but I don't know what to do.... Warning: Error updating Surface. Update failed for unknown reas...

2 months ago | 2 answers | 0

### 2

answersQuestion

don't get what solve should return as solution

Hi! I am new to symbolical equations in MATLAB. I have written the dynamics of a mobile inverted pendulum. The solution of the p...

2 months ago | 1 answer | 0

### 1

answerQuestion

how to extract the big content of a cell array?

Hi! I have a 2859x1 cell array. In each cell there is a content like this: 1617026479572040798,,0,,0,0,'',25.0,,,[],0,"[76, 7...

2 months ago | 0 answers | 1

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answersQuestion

how to create and save a georeferenced image in .tif format?

Hi! I have 3 arrays 318x2000: the first one contains the pixel values of a grayscale image I and the others the lat and lon va...

3 months ago | 0 answers | 0

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answersQuestion

why do I get a strange result with griddata cubic?

Hi! I used the griddata cubic interpolation for the values of an image. I get this image that has a much higher range, from -300...

3 months ago | 1 answer | 0

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answerQuestion

Error using griddata v4

I get this error using griddata v4. What's the problem? Error in griddata>gdatav4 (line 247) d = abs(xy - xy.');

3 months ago | 0 answers | 0

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answersQuestion

differences between griddata interpolation methods

Hi! I don't find the official documentation about the differences between the griddata interpolation methods. I have found only ...

3 months ago | 0 answers | 0

### 0

answersQuestion

someting wrong using interp2

I would like to interpolate the values of an image I. The pixels of I have a specified position in point_seabed_e and point_seab...

4 months ago | 1 answer | 0

### 1

answerQuestion

How can I plot intensity values given pixel positions?

Hi! I have a matrix with intensity values that are the pixels of an image 318x1000. I have to locate these pixels in fixed pos...

5 months ago | 0 answers | 0

### 0

answersQuestion

How to add .stl file to a robot?

Hi! I would like to add an .stl file to a robot link created with the robotic toolbox. I checked the Visuals field of the body a...

5 months ago | 0 answers | 0

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answersQuestion

difference between Geolocated Data grids and Regular data grids

Hi! what's the difference between Geolocated Data grids and Regular data grids? I have to create an image with intensities that ...

6 months ago | 0 answers | 0

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answersQuestion

How to set the center of mass of a prismatic joint?

Hi! How can I set the Center of mass of a link with a prismatic joint? Is my code correct? %SCARA a1=0.2; a2=0.25; d3=0.2; ...

6 months ago | 1 answer | 0

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answerQuestion

How to compute Coriolis matrix?

Hi! I am using the Robotic system toolbox and I need to compute the coriolis matrix C(q,dq). There is only a block that computes...

7 months ago | 0 answers | 1

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answersQuestion

starting condition of feedback scheme in simulink

Hi! How can I set a starting condition as input of my system? The input at t=0 is a constant error vector, but I don't know how...

7 months ago | 0 answers | 0

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answersQuestion

how to fix ode45 parameters?

Error using derivative Expected state to be finite. Error in jointSpaceMotionModel/derivative (line 251) valida...

8 months ago | 1 answer | 0

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answerQuestion

how to sum vector with simulink sum block

Hi! I would like to sum the fisrt element of a vector with the first one of another one and so on with the simulik sum block. Ho...

8 months ago | 1 answer | 0

### 1

answerQuestion

from urdf to simscape model

Hi! Can I import a .urdf file into a simscape model? How?

8 months ago | 1 answer | 0

### 1

answerQuestion

where can I find urdf models?

Hi! Where can I find urdf files to import on MATLAB? Otherwise if I downloaded a kuka CAD .stp, how can I transform it into .urd...

8 months ago | 1 answer | 0

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answerQuestion

expression that changes if a condition is true

Hi! I know it's a silly question but I don't remember how to write an expression like that theta=psi+pi*(condition:x<0) and I ...

1 year ago | 1 answer | 0

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answerQuestion

Can't save a video with VideoWrite: Error [Frame must be 550 by 420]

% video traiettoria v = VideoWriter('traiettoria'); open(v);% figure scatter(0,0,200,'r','filled','s'); hold on; grid o...

1 year ago | 1 answer | 0

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answerQuestion

Extented kalman filter implementation

Hi! I would like to implement the EKF of this system in matlab the state variable are north and east coordinates, module of v...

1 year ago | 0 answers | 0

### 0

answersQuestion

from posix to date

Hi, I am trying to use this command to convert the time vector t_ne expressed in posix time to a date d = datetime(t_ne, 'Con...

1 year ago | 1 answer | 0