# Marta Salas

Physicist.

PhD candidate on Computer Vision and Robotics.

Professional Interests: SLAM, computer vision

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Solved

Make the vector [1 2 3 4 5 6 7 8 9 10]

In MATLAB, you create a vector by enclosing the elements in square brackets like so: x = [1 2 3 4] Commas are optional, s...

8 years ago

Solved

Times 2 - START HERE

Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y. Examples:...

8 years ago

Plotting equation as a function

k=0.4; alpha=0.5; tau=50; h=30; % Define the values within the interval for gamma minValue = 2*h/pi; maxValue = ...

8 years ago | 1

| accepted

can anybody help in understanding fopen and fread?

The file identifier is a integer greater than 3. Identifier -1 means fopen can not open the file, and MATLAB reserves file ident...

9 years ago | 0

How to get all possible arrangements for n=10 and more

http://www.mathworks.com/help/matlab/ref/perms.html [Limitations: perms(v) is practical when length(v) is less than about 10.] ...

9 years ago | 0

Error: Unexpected MATLAB expression. SYNTAX ERROR?!

You need to checked carefully what you have written in the definition of G, I have spotted some * missing, there is also a missi...

9 years ago | 1

| accepted

How to join two codes of images?

In order to not copy manually the coordinates of your ROI, you have to keep them on a variable and return the variable as an out...

9 years ago | 0

| accepted

Segmentation fault when printing images with transparency and -nodisplay option

I'm answering my own question, just in case someone else run into this problem (although it's improbable). The purpose of runnin...

9 years ago | 1

| accepted

How to draw a figure?

you can try surf or mesh: <http://www.mathworks.es/es/help/matlab/learn_matlab/creating-mesh-and-surface-plots.html>

9 years ago | 0

Operands to the || and && operators must be convertible to logical scalar values.

_find_ returns the indexes of the values that holds the condition 5.2=< x >=8.50 index = find(x>=5.2 & x<=8.50) To know...

9 years ago | 1

Need help with 3D surface plot of complex function

*s* is a complex number and so it's F(s) (*z* in your code). This is why the problem ask you to plot the magnitude of F(s) which...

9 years ago | 0

Question

Segmentation fault when printing images with transparency and -nodisplay option

I'm running MATLAB 2012a on Linux's command line with -nodisplay option. When I run my code I get a segmentation fault. The foll...

9 years ago | 1 answer | 1

### 1

answerAny alternative to kmeans functions for image processing toolbox?

Piotr's toolbox contains a kmeans function (folder classify: *kmeans2*). It's open source, you can download it from this link: h...

9 years ago | 0

Inserting Color Map value in an image

You can copy the code you are using to be able to help you. You can also try this function: function make_video(video_dir...

9 years ago | 0

The script will read in image files (jpg) into a “cell” array then display them

have you look at the functions _imread_ and _imshow_ ?

9 years ago | 0

intersection of two triangles

% this define the vertexes (x,y) of first triangle trian1x =[ 0 0.5 1 0]; trian1y =[ 0 1 0 0]; % this d...

9 years ago | 3

| accepted

How to write multiple txt files from workspace matrix?

X= 1:size(My_matrix,1); for it=1:size(My_matrix,2) filename = ['Mytext' num2str(it) '.txt']; data = [X' My_m...

9 years ago | 2

| accepted

Function to evaluate arguments using pol2cart

As arguments for your function you have to write the name of the variable: function x = Carlos_Virguez_Ex14(r,angle) No...

9 years ago | 0

Problem in Plotting graph.

p=120000; t=288; dax=0.1; m=150; r=287; cp=1004; row=1.45; v=50:300; dvx=-0.145*v./(0.145+(0....

9 years ago | 0

| accepted

How to rename images from a series of folder

mainDirectory = 'C:\Users\md\Desktop\NewFolder'; subDirectory = dir([mainDirectory '/N*']); for m = 1 : length(s...

9 years ago | 1

| accepted

element wise sum in array

You have to use a dot in front of the operation: *.** *.^* to mean element-wise operation in matlab t = [20 30 22 32 10 1...

9 years ago | 0

| accepted

using predefined string for savefig

fileparams = ['50psi_10A_Sawtooth_05Hz'] filename = [fileparams '.fig'] print(filename)

9 years ago | 1

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How can I shading plot?

Color is defined as a vector of 3 values: RGB. When you select 'g' on you plots this vector is [0 1 0]. 'r' is [1 0 0] or 'b' is...

9 years ago | 0

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Save values in the middle of a loop

You could save them as mat files http://www.mathworks.es/es/help/matlab/ref/save.html

9 years ago | 0

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comando stem en guide

Maybe this helps: http://www.mathworks.com/matlabcentral/answers/102384-how-do-i-make-my-gui-plot-into-an-axes-within-the-gu...

9 years ago | 0

Joining jpg files to make a video

I use MATLAB2012a, you can try if this function works for you. The input arguments are: the path to the images (vide_dir), exten...

9 years ago | 1

| accepted

Please provide me a matlab source code for running number of files in a loop.

video_dir = 'snaps/' extension = 'jpg' out_dir = 'video/' resnames=dir(fullfile(video_dirs,['*.' extensio...

9 years ago | 0

| accepted

how to display the clustered values which are clustered using k means clustering?

There is an example on how to plot the clusters and the cluster centroids here: http://www.mathworks.es/es/help/stats/kmeans.htm...

9 years ago | 0

Create two vectors X and Y of values from (-pi) to pi with a spacing of pi/10. Define the vector Z as: Z = (sin(sqrt(x^2+y^2)))/(sqrt(x^2+y^2))

[x,y] = meshgrid(-pi:pi/10:pi) z = (sin(sqrt(x.^2+y.^2)))./(sqrt(x.^2+y.^2)) mesh(x,y,z)

9 years ago | 0