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Efficiently populating an array without for loops
Yeah that's searching through your data an awful lot every time you do the |==| comparisons. The way I do this kind of thing wh...

12 years 前 | 0

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how to label the vacant space
I wouldn't use regionprops here. That just connects pixels. You can't guarantee that will have anything to do with empty parkin...

12 years 前 | 0

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Compare two strings based on ASCII dictionary order
Yeah this is a real failing of the |strcmp| function in my opinion. That function originated in C, and would tell you whether a...

12 years 前 | 3

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two picture pixels
You are addressing |fd(:,:,:,a)| as a 4-dimensional array, but it is declared as a 1-dimensional array. You need to make sure...

12 years 前 | 0

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Reading Binary(?) to hex to float.
Um, you're reading one at a time? Can you not first determine the file size: fseek(fid, 0, 'eof'); fsize = ftell(fid)...

12 years 前 | 1

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Estimation of the "pixelization" error introduced when using the digital image processing toolbox
This is just a stab in the dark, but I gather that after processing you get an image with logical (0 or 1) pixels, and you obta...

12 years 前 | 0

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search algorithm in the volume of a cone.
Well, you need a point that defines the apex of the cone, a vector definining the cone's major axis, and the half-angle (angle b...

12 years 前 | 0

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How to stack image files if they are of different size
When you say 'stack', are you storing each image as a 'page' in some dimension? So you might have: imageStack = nan( maxHe...

12 years 前 | 0

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Creating .txt file with matlab
This opens the file once (overwriting if it already exists) and writes your results one line at a time. fid = fopen( 'resul...

12 years 前 | 4

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How to read any file by using txt ?
The only difference between reading a binary file versus a text file is to translate end-of-line characters. Other than that (a...

12 years 前 | 0

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how to read complicated CSV files into matlab?
Easiest is to read your file one line at a time, and separate your sections. If your files follow exactly the format you've lis...

12 years 前 | 0

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custom byte swapping of binary file
Hey Peter, do you actually know the format of your data? I was under the impression that you didn't know what the binary struct...

12 years 前 | 2

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grouping observations with specific characteristics
You mean you want to sort by Location, then Time, then Country, then Price? Before you go MatLabbing this... Would you consi...

12 years 前 | 0

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Select data by attributes
Do you mean you have a structure: Polylines.Accuracy Polylines.SomeOtherField1 Polylines.SomeOtherField2 ... etc ...

12 years 前 | 1

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Connected component labeling
Is this an assignment for a course you are doing? If so, what algorithms have you discussed in lectures? Surely you would not ...

12 years 前 | 1

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image color detection
What about purplish-greenish-gray? Where do you draw your boundary? Anyway... A simple approach here is to define all t...

12 years 前 | 1

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How to create a regular data matrix from irregularly sampled XYZ data with different X and Y coordinates
Well, I might do this: d = [2.0000 0 0.3800; 2.0000 5.0000 0.3480; 2.0000 25.0000 0.3...

12 years 前 | 0

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Find Angle Between Two Line
When I want to find the angle between two vectors, I take the dot product of the unit vectors: clamp = @(val, low, high) mi...

12 years 前 | 0

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Help Sorting columns
Get the indices for sorting the last row: [~, I] = sort( data(end,:) ); And then reindex your matrix: sdata = data(...

12 years 前 | 1

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Index for loop
To do this in a loop (not the |find| command), you are doing a few things wrong. Here is your code: i=1; for item...

12 years 前 | 0

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I need one by the element-free Galerkin method for solving one-dimensional Burgers equation Matlab procedures, thanks a lot
There is some code here which is just waiting for a little more clarification from its author before the MatLab community can he...

12 years 前 | 0

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non linear data fit (weighted least square)
Let's say you have your function: f = @(x,a,b) = a * x.^b; Now, you have your data set and weights: X = [...]; Y...

12 years 前 | 1

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rolling dice problem in cody..........error in this code??
Don't use round: |randi| already returns integers.

12 years 前 | 0

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subscript indices must either be real positive integers or logicals - how to change lat/lons from double to integers?
If they just need to be indices, you can use |ceil|, |floor|, |fix| or |round|. _eg_ x = fix(x) If you want to convert ...

12 years 前 | 0

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vector sum and magnitude
Maybe this will help: function [vec, mag] = DoMyHomeworkForMe( v1, v2 ) % Your calculation goes here end

12 years 前 | 1

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generating executable file
You must install the MCR on that system. Search your matlab installation tree for |MCRInstaller.exe| On my system it is in...

12 years 前 | 0

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What value have a variable 'edit text' guide
No, you need to use |isempty|. if isempty(T) T = 0.001; end Note that if you use |str2double| instead, you'll ge...

12 years 前 | 1

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Image segmentation problem, need help
That's a cool problem. I would tend towards a solution that involved filling the 'empty' region from your thresholded 3rd image...

12 years 前 | 0

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Order cell array
There's a couple of ways to do this... I assume you want the numbers in ascending order. This works, but relies on the stabili...

12 years 前 | 0

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problem with rotation matrix
Your code works fine, but you're just not plotting it correctly. plot(obstacle_shape(:,1), obstacle_shape(:,2)); You m...

12 years 前 | 0

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