Respondida
how to compute gradients of image using gradient() in matlab2010
As Thorsten says, you should always post the error message. But here's a guess at what might help: im=imread('31.png'); ...

más de 9 años hace | 0

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To run a function
If you call the function without a result variable, MATLAB assigns the result to the variable |ans|. That is min([3 2 1 5 6...

más de 9 años hace | 1

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how can i set the pixel intensity values (I) that fall in the range, 200> I >30 to I = 200.
Img(200 > Img & Img > 30) = 200;

más de 9 años hace | 0

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How do I calculate yearly average value for large data set with uneven time spacing?
If your 2-column matrix is A, try: years = floor(A(:,1)); data = A(:,2); means = accumarray(years, data) ./ accumarra...

más de 9 años hace | 1

Respondida
Is there a simple way to reference months from data in matlab time?
Using the attached function, you can do this: [isplit, ~, meantime] = splitTimes(tm, 'month'); % get start and end point of...

más de 9 años hace | 1

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assigning to object variables from within-object functions
MATLAB always makes a copy when you assign an object, or pass an object to a function. Here's another example of the same thing,...

más de 9 años hace | 0

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Why do get error in line 10: Function Keyword is invalid here. This might cause later messages about end.
You can't mix a script and a function in the same m-file. If an m-file contains a function, the first line of code in the file m...

más de 9 años hace | 2

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Respondida
how to evaluate a convolution integral by fast fourier transform
Correct zero-padding to use the FFT for 1-D or 2-D convolutions is implemented in my FEX submission <http://uk.mathworks.com/mat...

más de 9 años hace | 0

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Respondida
Is there a way to direct an algorithm in edge detection, or correct my drawing outline of the edge?
This is exactly what active contours, or snakes, were originally designed for. If you have the Image Processing Toolbox, have a ...

más de 9 años hace | 0

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Delete a column from an array of uncertain size?
The trick needed is to use the fact that cell arrays can be expanded into comma-separated lists, so can represent any number of ...

más de 9 años hace | 1

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how can i save pixel changes in image?
Could be because JPEG compression loses information, so a write followed by a read only returns an approximation to the original...

más de 9 años hace | 0

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Respondida
How to arrange stacked Images into a 2 dimension array?
Images2d = reshape( ... permute( ... reshape(Images, 1000, 1000, 8, 5), ... ...

más de 9 años hace | 0

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Can you use MATLAB for 3D Image Processing?
It may be useful to look at the <http://uk.mathworks.com/products/computer-vision/index.html Computer Vision System Toolbox>, wh...

más de 9 años hace | 1

Pregunta

parfor warning and analysis of switch statement
I have two functions which are, I think, functionally identical. Both use a |parfor| loop. If the logic within the loop is expre...

más de 9 años hace | 1 respuesta | 1

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Respondida
the rang of unit 8 is 0-255 But im2double convert the range to [0, 1] instead of [0, 255]. please anyone explain it????
It's very helpful to have a standard range of values for images. The convention used in MATLAB toolbox functions is that images ...

más de 9 años hace | 3

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what are the units of the houghlines 'FilleGap' and 'MinLength' ?
Yes, they are in pixels.

más de 9 años hace | 0

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Respondida
[DEPRECATED] What frustrates you about MATLAB?
The |inputParser / validateattributes / validatestring| collection of function parsing and checking tools. * You have to writ...

más de 9 años hace | 5

Respondida
Using knnsearch to find nearest values ignoring NaN's
You need to organise the nearest neighbour search so that it uses both latitude and longitude together, not search each separate...

más de 9 años hace | 0

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Respondida
Undefined function 'mtimes' for input arguments of type 'audiorecorder'.
Presumably you replaced data = wavrecord( ... ); by data = audiorecorder( ... ); (I don't know what arguments we...

más de 9 años hace | 0

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Respondida
Matrix dimension reduction based on summation
If you try to reduce an 81 x 81 matrix to a 10 x 10 matrix it is bound to be messy, because 81 is not a multiple of 10. You have...

más de 9 años hace | 1

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Respondida
Multiplying structures together based on field names
A function to multiply two structures field by field. This needs to be copied into a file on your MATLAB path called multiplyStr...

más de 9 años hace | 0

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Respondida
How to change a range of pixel values in a Grayscale JPEG image?
Like this (where A is the array containing the image): A(A >= 60 & A <= 95) = 255; By the way, that the image is stored ...

más de 9 años hace | 0

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Splitting an array and working on individual sections.
If you want to put the four smaller arrays into separate variables, you can do it like this (assuming the sizes are even as stat...

más de 9 años hace | 0

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Improve efficiency of array multiplication
The value of SW is not used in the code you've shown. If you don't need the value of SW, it will help to omit this line. If you ...

más de 9 años hace | 0

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subtraction ele by ele
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más de 9 años hace | 0

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What is an edge exacty in matlab? is it simply a line ?
I assume you're referring to David Legland's <http://www.mathworks.com/matlabcentral/fileexchange/7844-geom2d toolbox> from the ...

más de 9 años hace | 0

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Respondida
How can use a for loop to name a matrix?
One way is to use a cell array, like this for trials = 1:max_trials < compute result, assign to a > output_matri...

más de 9 años hace | 0

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Using fileparts and combining with a different file name
The last line should be filenc = [fName '.nc']; What you are doing here is concatenating two strings. Square brackets ca...

más de 9 años hace | 1

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Respondida
What causes an "Argument to dynamic structure reference must evaluate to a valid field name" error please? code attached.
The dot after |sin| makes it look like a structure rather than a function call. Omit the dot.

más de 9 años hace | 1

Respondida
Filling in array with specific numbers
One way, using |repmat| to make the repeated values: % test data A = [1;2;3]; B = [11;12;13;14]; C = [21;22;23]; ...

más de 9 años hace | 4