# Raldi

### Technological Educational Institute of Athens

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**Feeds**

Question

Best way of drawing multiple circles and updating their position

What is the best way to draw a variable number of circles in a plot and update their position? I have tried F = rectang...

6 years ago | 3 answers | 0

### 3

answersQuestion

Define an ellipse with a given angle and find if a point lies inside its boundaries

<</matlabcentral/answers/uploaded_files/116287/Screenshot%20from%202018-05-06%2015-58-52.png>> I have a number of points repr...

6 years ago | 1 answer | 0

### 1

answerQuestion

Update viscircles position in an interactive plot

I am creating a circle at a specified position using F = viscircles([Xposition Yposition], radious); Later on the code...

6 years ago | 0 answers | 0

### 0

answersQuestion

Plot a moving dot inside a quiver plot that is constantly being updated

I have the following code that will create a quiver plot (imagine a team of players in a football game) and I would like to upda...

6 years ago | 1 answer | 0

### 1

answerQuestion

Find neighboring nodes in a list of node positions

I have two vectors of X and Y positions x = randn(10,1); y = randn(10,1); So *x(1)* with *y(1)* together make the po...

6 years ago | 2 answers | 0

### 2

answersQuestion

How to compute softmax and its gradient?

I am creating a simple two layer neural network where the activation function of the output layer will be softmax. I have thi...

7 years ago | 0 answers | 1

### 0

answersQuestion

Get bits of number.

I have a _16 bit_ double I got from using *wavread* that I want to get the first _8 bits_ from. As an example lets say I hav...

9 years ago | 1 answer | 0

### 1

answerQuestion

Function similar to isnan for zeros

Is there a function that does what isnan does but with zeros?

9 years ago | 1 answer | 0

### 1

answerQuestion

Create black columns/rows in image.

Hi everyone, I have an image and I want to only keep visible small patches of lets say 8x8 alternatively. So I start at th...

9 years ago | 2 answers | 0

### 2

answersQuestion

Find struct size in bytes.

Hi all, I have a struct element that contains some vectors and another struct that in it's turn contains some more data. What...

10 years ago | 1 answer | 0

### 1

answerQuestion

Matrix indexing, getting back my original matrix.

Hi, I have a matrix mat= [ 1 2 3 4 5 6 7 8 9; ... 1 2 3 4 5 6 7 8 9; ... 1 2 3 4 5 6 7 8 9; ... ...

10 years ago | 2 answers | 0

### 2

answersQuestion

Correct way of using blockproc

I have a matrix, and a function similar to function val = name(matWin, a, b, c) What is the right way of calling _blockp...

10 years ago | 1 answer | 0

### 1

answerQuestion

Quickly create a vector of ones and zeros

My question is if there is a way to create a vector of zeros vec = 0 0 0 0 0 0 0 0 and specify a position lets s...

10 years ago | 5 answers | 0

### 5

answersQuestion

Apply function to image window.

Hi all, After reading an image and converting it to gray I want to apply a simple function I created est = findest(seg...

10 years ago | 0 answers | 0

### 0

answersQuestion

Using a base bigger than 36

Hi everyone, Do you know how can I possibly transform a vector that could be _base2_ , _base7_ , but also bigger like _base1...

10 years ago | 1 answer | 0

### 1

answerQuestion

Matrix with all possible value combinations

Hi everyone, I have a quick question. Lets say i want to form a matrix with all possible combinations of some acceptable valu...

10 years ago | 1 answer | 2

### 1

answerQuestion

Import .csv that has the characters '-'

I have an .csv file as you can see below and was wondering how to import it into matlab. 'csvread' wont work from what I've tr...

10 years ago | 1 answer | 0

### 1

answerQuestion

Use abslolute colormap scale.

Hi everyone, I have a quick question. Lets assume that we have a two dimentional matrix and each of its values represents the t...

11 years ago | 1 answer | 0

### 1

answerQuestion

How to use an absolute scale with colormaps

Hi everyone, I am using image to plot a matrix of some heat data, the thing is that i want a specific color mapped in a spec...

11 years ago | 1 answer | 0

### 1

answerQuestion

Stop a while loop using a GUI

Hey everyone, I need to stop a while loop using a 'Stop' button in a GUI and i was wondering what are the best ways of doing...

11 years ago | 3 answers | 0

### 3

answersQuestion

Dynamicaly show size of imrect

Hi guys, I wanted to know is there a way to make imrect show its x and y length while the user is moving it inside the axes. ...

11 years ago | 1 answer | 1

### 1

answerQuestion

Make button down function work for objects inside axes.

Hi, I have a quick question, I am using the "WindowButtonDownFcn" in order to get the location i clicked inside an axes object...

11 years ago | 1 answer | 1

### 1

answerQuestion

Matlab GUI problem with multiple panels

Hello, I have created this big GUI(not using guide) that has 3 main panels, each one of them with different axes and buttons....

11 years ago | 1 answer | 0

### 1

answerQuestion

Compute average of each value in a matrix without using for

Hi all, I was wondering is it possible to alter each value of a matrix based on the average value of its neighbors, wihtout u...

12 years ago | 1 answer | 0

### 1

answerQuestion

Use a nx2 matrix to indicate desired positions on another matrix

Hello everyone, I have a quick question, how can i use the matrix lets say pos = [1 2; 3 3]; as a guide to change the...

12 years ago | 1 answer | 0

### 1

answerQuestion

Update a text object's position used with a movable rectangle.

Quick question, Lets say i have created a rectangle using h(i) = imrect(gca, [1,1,4,4]); and then i add a text object ...

12 years ago | 1 answer | 0

### 1

answerQuestion

How to pass values into addNewPositionCallback

Hey guys, I am using the following line of code id(i) = addNewPositionCallback(h(i),@updateFun); but when i try to mo...

12 years ago | 0 answers | 0

### 0

answersQuestion

How can i know what object created with imroi did i move

Lets say i create a bunch of rectangles usind the following way for i = 1:2 h(i) = imrect(gca, compdata(i,:)); ...

12 years ago | 1 answer | 0

### 1

answerQuestion

Pass variables into set(frt,'WindowButtonDownFcn',@mousePos)

Quick question, how can i pass some other variables that i want in mousePos function mousePos(hObject,~) mPos=get(hObjec...

12 years ago | 2 answers | 0

### 2

answersQuestion

Store the objects you create and then pass them into another function

Hi everyone i have the following code, and what i want to do is somehow make it update each time the value of the component ...

12 years ago | 0 answers | 0