# Alberto Acri

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**Feeds**

plot some nodes from an .txt file

Hi @Mathieu NOE I tried using the various functions to retrieve the outermost nodes for other types of curves like the ones att...

6 days ago | 0

Question

orthogonal projection of 3D nodes onto a 2D plane

I need to project 3D nodes (nodes) onto a 2D plane that I got from the code in FEX. load xyz fobjPlane=planarFit(xyz); for ...

10 days ago | 1 answer | 0

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answerQuestion

create a 3D smoothing with csaps (or similar)

To get a better set of nodes arranged in space as a ‘curve’, how can I improve this code? Could you suggest? load curve_1 cc...

11 days ago | 2 answers | 0

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answersQuestion

find the inflection point of a curve 3D (set of nodes) in matlab

How can I determine the inflection point of a set of nodes generating a curve in 3D space? load curve_1.mat curve_x = curve_1;...

15 days ago | 1 answer | 0

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answerQuestion

create a 3D average plan (or normal) from two 3D plans (or normals)

How can I determine the average plan knowing the plans of the two attached sets of nodes? load plan_1_2.mat figure plot3(plan...

17 days ago | 1 answer | 0

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answerQuestion

create a 3D average curve from two 3D curves

I have curves M1 and M2 composed of x nodes in space. Is it possible to create an average curve (up to a specific height, from...

18 days ago | 1 answer | 0

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answerQuestion

Split two 3D geometries having the same matrix of nodes and faces

I have a matrix containing the nodes and a matrix containing the triangular faces of two 3D geometries as shown below: Is there...

29 days ago | 1 answer | 0

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answerQuestion

Find the coordinates of the nodes of an matrix inside another matrix

I would like to find the coordinates of the nodes of an matrix 'nodes_portion' inside a larger matrix 'nodes_e'. (In this case a...

29 days ago | 1 answer | 0

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answerQuestion

calculate the normal of a 3D plane

Hi! I have a circular plane, whose coordinates of the points of the circumference are: P = importdata("node_plane.mat"); plot3...

1 month ago | 1 answer | 0

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answerQuestion

extracting matrices of numbers from a text file (txt) also containing words

I have a txt file consisting of numbers and words as you can see in the attachment. I have to create two matrices M1 and M2 wit...

3 months ago | 1 answer | 0

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answerQuestion

Locate two neighboring nodes in space so as to divide the matrix into two

I have the coordinates of nodes arranged in space in the shape of 8. Is there a way to locate the nearest points as marked in ...

4 months ago | 1 answer | 1

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answerQuestion

generate average numbers between two numbers inside a vector

Hi! It is easier with the figure than with words. I want to create average numbers between two numbers and insert them instead o...

4 months ago | 1 answer | 0

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answerQuestion

split a matrix into two matrices according to some rule

How can I generate two separate matrices, one containing the coordinates of line A and the other of line B? load matrix figu...

4 months ago | 1 answer | 0

### 1

answerQuestion

search for the position of a number inside a cell (cell with existence of empty rows)

I am trying to look for each row of 'N' inside a cell. I am using 'find' but it doesn't seem to work. I should identify, in t...

4 months ago | 2 answers | 0

### 2

answersQuestion

Identify coordinates of nodes in a matrix above/below the coordinates of a plane

Is there a way to identify the coordinates of nodes (black nodes,'DATA_select') above (green selection) or below (purple selecti...

4 months ago | 1 answer | 0

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answerQuestion

Create a node in the space between two nodes (A and B) and following the direction normal to a node (N)

Hi. I need to create a node in the space between two nodes (A and B) and following the direction normal to a node (N) as in the ...

4 months ago | 4 answers | 0

### 4

answersQuestion

incorrect reading of a txt file

I have this .txt file that I have to read in Matlab. The first line is text and the second line onwards are numbers. Using 'imp...

5 months ago | 1 answer | 0

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answerQuestion

reverse operation to 'strsplit'

Hi! I have a cell like 'temp'. And I need to transform it (by adding '_') to get a char like 'a'. How can this be generated? a ...

5 months ago | 1 answer | 0

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answerQuestion

calculate the perimeter of a polygon arranged in space

Hi. I need to calculate the perimeter of the geometry in the figure. load plane_new figure x = plane_new(:,1); y = plane_new...

5 months ago | 2 answers | 0

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answersQuestion

creating nodes on an axis normal to a plane

Hi! How can I generate more nodes along a normal to the plane? They must extend to a length L. I would like to arrange the nodes...

5 months ago | 3 answers | 0

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answersQuestion

Generate coordinates (3D), having the same contour as the initial circle but with a smaller size

Hi! Starting from nodes arranged as a circle in space (blue points), I must generate others having the same outline as the blue ...

5 months ago | 1 answer | 0

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answerQuestion

Find coordinates inside a matrix with specific conditions

I need to identify 3 nodes (the green ones, but it can also be the blue ones) within a matrix that generates a "circle" in space...

5 months ago | 1 answer | 0

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answerQuestion

Improving the interpolation of nodes arranged in a circle on a plane

I am using this code to improve the interpolation of nodes arranged in a circle on a plane. As input I have the nodes 'outermos...

5 months ago | 2 answers | 0

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answersQuestion

Determine the coordinates of the nodes forming the outermost circle

Hi! How can I extract only the coordinates of the nodes forming the outermost circle? The nodes are located on radius R = 4! no...

5 months ago | 3 answers | 0

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answersQuestion

Determining area considering nodes arranged in space in an almost circular shape

Hi. I have the attached nodes arranged in space. I would like to calculate the area having the nodes as boundaries. I'm trying ...

5 months ago | 1 answer | 0

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answerQuestion

Determining the coordinates of a node between two known nodes and knowing the distances between the known nodes

Hi! This may seem like a rather trivial question. Do you know how to determine the coordinates of a node C knowing node A, node ...

5 months ago | 3 answers | 0

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answersQuestion

find similar numbers within a matrix

Hi. I need to identify the position of a triplet of numbers (P) inside an array (M). P = [-3.4970900e+01 -2.0289890e+02 -1...

5 months ago | 5 answers | 0

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answersQuestion

convert a cell (Rx1 cell) to a vector (Rx1 double)

Hi. I want to convert the cell 'rows_check_n' into a vector of type double with the numbers inside the cell. I tried 'cell2mat'...

6 months ago | 2 answers | 0

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answersQuestion

identify rows with [] within a cell

Hi! Is there any way to identify rows with [] within a cell? Something that is analogous to 'find'. [rr,cc] = find(M(:,1) == []...

7 months ago | 1 answer | 0

### 1

answerQuestion

create empty pie chart (or not generate the graph)

Hi! I would like to create empty pie chart (I know it is not very useful). Using 'pie' does not allow this. so I had thought o...

7 months ago | 1 answer | 0