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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

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Mex results different from linux to windows!

I answer myself. The problem was related to the function abs. In gcc, math.h has a C version of abs that works on integers, so g...

Mex results different from linux to windows!

I answer myself. The problem was related to the function abs. In gcc, math.h has a C version of abs that works on integers, so g...

8 years ago | 0

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Question

Mex results different from linux to windows!

Hello everyone. I have a mex routine written in C++ that I use on a Windows computer compiled through Visual Studio. Now I ne...

8 years ago | 1 answer | 0

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may i directly convert video to text document using matlab ?

You can use matlab OCR function: <http://uk.mathworks.com/help/vision/examples/recognize-text-using-optical-character-recogni...

may i directly convert video to text document using matlab ?

You can use matlab OCR function: <http://uk.mathworks.com/help/vision/examples/recognize-text-using-optical-character-recogni...

8 years ago | 0

Answered

how to display a query image and database side-side ? i have few lines but i am not able to proceed ahead with them as they are incomplete .

Maybe you want to use subplot: figure subplot(1,2,1) imshow(im1) subplot(1,2,2) imshow(im2)

how to display a query image and database side-side ? i have few lines but i am not able to proceed ahead with them as they are incomplete .

Maybe you want to use subplot: figure subplot(1,2,1) imshow(im1) subplot(1,2,2) imshow(im2)

8 years ago | 0

Submitted

Where am I in the code?

Simple script to open the editor on the current debugging line

8 years ago | 1 download |

Answered

How to stop printing anything to command window?

The best solution would be using disp inside an if statement. A really bad soulution (still working) would be replacing the fun...

How to stop printing anything to command window?

The best solution would be using disp inside an if statement. A really bad soulution (still working) would be replacing the fun...

8 years ago | 0

Answered

script running for 13 hours. should I be worried?

You can use a task manager to check if matlab is still using the CPU. If not, it probably got stuck.

script running for 13 hours. should I be worried?

You can use a task manager to check if matlab is still using the CPU. If not, it probably got stuck.

8 years ago | 0

Answered

Find the distance between object and camera

Calculating the distance between an object and a camera in not an easy task. In theory, you would need two different cameras bec...

Find the distance between object and camera

Calculating the distance between an object and a camera in not an easy task. In theory, you would need two different cameras bec...

8 years ago | 0

Answered

Why are vectors horizontally and matrices vertically indexed?

Matlab variables are always indexed vertically. What you are talking about is a plot behaviour: plot(X,Y) plots vector Y v...

Why are vectors horizontally and matrices vertically indexed?

Matlab variables are always indexed vertically. What you are talking about is a plot behaviour: plot(X,Y) plots vector Y v...

8 years ago | 0

Answered

estimate time needed for a code to finish

This is my favourite solution: tic for i = 1:1e9 if toc > 10 fprintf('Iteration %d/%d\n',i,1e9) ...

estimate time needed for a code to finish

This is my favourite solution: tic for i = 1:1e9 if toc > 10 fprintf('Iteration %d/%d\n',i,1e9) ...

8 years ago | 2

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Answered

Calculating statistical PDF and percentiles over matrices

You can replace x with x(:) in prctile. The whole matrix will be squeezed in a single vector what will be evaluated just once.

Calculating statistical PDF and percentiles over matrices

You can replace x with x(:) in prctile. The whole matrix will be squeezed in a single vector what will be evaluated just once.

8 years ago | 0

Answered

The definition of variables

You can create integer random vectors with randi(), convert it to binary with de2bi(), and convert input binary to decimal with ...

The definition of variables

You can create integer random vectors with randi(), convert it to binary with de2bi(), and convert input binary to decimal with ...

8 years ago | 0

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Answered

HELP with Undefined variable, size of the indicated variable changes with each loop iteration.

The variable files is a cell array, and you are trying to refer it as a matrix. You should use files{i} instead of files(i,1) wh...

HELP with Undefined variable, size of the indicated variable changes with each loop iteration.

The variable files is a cell array, and you are trying to refer it as a matrix. You should use files{i} instead of files(i,1) wh...

8 years ago | 0

Answered

how can i make my scattered 3 dimensional data points as a 3d surface?

tri = delaunay(k(:,1),k(:,2)); trisurf(tri,k(:,1),k(:,2),k(:,3))

how can i make my scattered 3 dimensional data points as a 3d surface?

tri = delaunay(k(:,1),k(:,2)); trisurf(tri,k(:,1),k(:,2),k(:,3))

8 years ago | 0

Answered

how to read audio file?

You can use audioread: http://uk.mathworks.com/help/matlab/ref/audioread.html

how to read audio file?

You can use audioread: http://uk.mathworks.com/help/matlab/ref/audioread.html

8 years ago | 0

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Answered

How to find the variance of an image in a special windows? variance(in 3*3 windows)

You can use the function conv2: A = imread('foo.bmp'); small_window = ones(3)/9; A_sq = conv2(A.^2,small_window,'s...

How to find the variance of an image in a special windows? variance(in 3*3 windows)

You can use the function conv2: A = imread('foo.bmp'); small_window = ones(3)/9; A_sq = conv2(A.^2,small_window,'s...

8 years ago | 0

Answered

Problem in Plot diagrams

I cannot see your attachment, but you can use any char you wish for your plot, just using text instead of plot: x = linspac...

Problem in Plot diagrams

I cannot see your attachment, but you can use any char you wish for your plot, just using text instead of plot: x = linspac...

8 years ago | 0

Answered

How to use threshold in this problem?

Supposed your image varies from o to 1, you could use a threshold in this way: THR = 0.5 above = image>=THR; imag...

How to use threshold in this problem?

Supposed your image varies from o to 1, you could use a threshold in this way: THR = 0.5 above = image>=THR; imag...

8 years ago | 0

| accepted

Answered

Distance from 3d point to an ellipse

A simple and straightforward solution could be discretizing the points of the ellipse, evaluating the distance from all the poin...

Distance from 3d point to an ellipse

A simple and straightforward solution could be discretizing the points of the ellipse, evaluating the distance from all the poin...

8 years ago | 0

Answered

How to convert an acceleration time graph, into a velocity time graph

You can integrate the acceleration vector with cumsum or cumtrapz to get the velocity, and again to get the space.

How to convert an acceleration time graph, into a velocity time graph

You can integrate the acceleration vector with cumsum or cumtrapz to get the velocity, and again to get the space.

8 years ago | 0

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Answered

plot smooth curve through discreet points

xx = linspace(min(x),max(x),100); yy = spline(x,y,xx); figure,plot(x,y,'o',xx,yy)

plot smooth curve through discreet points

xx = linspace(min(x),max(x),100); yy = spline(x,y,xx); figure,plot(x,y,'o',xx,yy)

8 years ago | 2

Answered

Solving an integral with variable as upper limit and plotting the solution

You can use cumsum or cumtrapz.

Solving an integral with variable as upper limit and plotting the solution

You can use cumsum or cumtrapz.

8 years ago | 0

Answered

what does this mean?

hblms is a struct array ( http://uk.mathworks.com/help/matlab/ref/struct.html ) Set its variable WeightsOutputPort to false

what does this mean?

hblms is a struct array ( http://uk.mathworks.com/help/matlab/ref/struct.html ) Set its variable WeightsOutputPort to false

8 years ago | 1

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Answered

Determing intermediate points in 3D mesh plot

If the points are on regular grid, you can use interp2: interp2(x,y,z,x0,y0,'cubic') Otherwise, you can scatteredInt...

Determing intermediate points in 3D mesh plot

If the points are on regular grid, you can use interp2: interp2(x,y,z,x0,y0,'cubic') Otherwise, you can scatteredInt...

8 years ago | 0

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Answered

Why is my surface not fitting the data points smoothly?

You can try to plot your surface with trisurf: [x,y]=meshgrid(1:15,1:15); tri = delaunay(x,y); z = peaks(15)...

Why is my surface not fitting the data points smoothly?

You can try to plot your surface with trisurf: [x,y]=meshgrid(1:15,1:15); tri = delaunay(x,y); z = peaks(15)...

8 years ago | 0

Answered

Stitching sub images to reconstruct full image

What about using mat2cell and cell2mat? It should be much easier.

Stitching sub images to reconstruct full image

What about using mat2cell and cell2mat? It should be much easier.

8 years ago | 0

Answered

surf plot- Z must be a matrix, not a scalar or vector.

The surf function requires the z values to be a matrix. If you have column data you can use trisurf, instead: tri = delaun...

surf plot- Z must be a matrix, not a scalar or vector.

The surf function requires the z values to be a matrix. If you have column data you can use trisurf, instead: tri = delaun...

8 years ago | 2

Question

Delaunay special constraints not being part of the triangulation

Hello, I'm trying to create a constrained delaunay triangulation of a set of points: in particular, I don't wont triangles to i...

8 years ago | 1 answer | 1

Submitted

Align equal sign

Automatically align equal sign in variables assignment

8 years ago | 4 downloads |