Matthew Eicholtz

Last seen: 10 months ago | Active since 2012

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I love MATLAB.

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How do I extract points from a plot for further computation?
Try using the <https://www.mathworks.com/help/matlab/data_analysis/marking-up-graphs-with-data-brushing.html Brush/Select Data> ...

6 years ago | 0

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How to use an index of a vector as a value in another matrix?
How about this? Assume you have the inputs: x = [1,1,2,2,3]; y = [1,3; 1,4; 2,3; 2,4]; Then, you can find indices ...

6 years ago | 0

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A button in GUI to move on to next image from a for loop in a different push button.
I would advise against "displaying the images from the directories in a for loop." What about the following setup? * *Pushbut...

6 years ago | 0

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How can I find instances of a given class that exist?
If I create a figure with several graphics objects, h = figure; axes(...); axes(...); axes(...); I can find ins...

6 years ago | 0 answers | 3

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How to select particular column in xlsx file using xlsread function of MATLAB ?
Does this work? A = xlsread('test.xlsx','sheet1','A:A'); M = xlsread('test.xlsx','sheet1','M:M'); plot(A,M);

6 years ago | 0

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Answered
Need to store some results of a function in a matrix
If I understand your problem correctly, the values stored in _A_ when _a_=4 are being replaced by the new values generated by yo...

7 years ago | 1

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Matlab comparison of two large matricies
A couple comments: 1. Did you mean to convert to the cell array in this manner? subA = num2cell(subA); If you want to...

7 years ago | 0

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padarray using a for loop
I think the error is because you are trying to assign a padded row vector of length M to the pre-padded row vector of length N (...

7 years ago | 0

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faster reading using csvread question
Have you tried <https://www.mathworks.com/help/matlab/ref/readtable.html readtable>? I haven't run any timing diagnostics to see...

7 years ago | 0

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Replace NaN by using for loop
When you say "it cannot be run", do you mean that you receive an error? If so, what line does the error point to and what is the...

7 years ago | 0

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i am using ga to find the initial weight of ann, So i need know about the fitness function?
It sounds like you need to decide on a fitness function to evaluate candidate solutions provided by the genetic algorithm. Perha...

7 years ago | 0

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I got wrong result when I read some bitmap file!!!
I suggest using <https://www.mathworks.com/help/matlab/ref/imread.html imread> instead.

7 years ago | 0

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Why would csvread read all data into a single column
I think dpb's comment addresses potential csvread issues well, so I'll just add an alternative option that may work for you: <ht...

7 years ago | 0

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How to run Libor Masek code?
I have no idea what Libor Masek code is, but I am familiar with this error. What are the dimensions of eyeimage? If the number o...

7 years ago | 0

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How to do k-fold cross validation in matlab?
I think the function <https://www.mathworks.com/help/bioinfo/ref/crossvalind.html crossvalind> may help. Check out the example o...

7 years ago | 1

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i've created a function to gather x and y coordinates from user, but i dont know how to call them out in program
I'm not sure what you mean by "call them out in program", but you can call this function in the Command Window or in another scr...

7 years ago | 1

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Help me with this problem
I don't think you need the for-loops here. Try this: A = [1 2 0 0; 2 1 2 0; 0 2 1 2; 0 0 2 1]; B = [0 5 34 22; 5 0 34 21...

7 years ago | 0

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Change specific color in an image to another one
This is a tough problem. Since you are using a raster image, objects that look purple are actually many small variations of purp...

7 years ago | 0

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How can I sort files into different folders?
Try this... Get the filenames: pathname = '\path\to\current\files'; ext = '*.csv'; % extension you care about d = ...

7 years ago | 0

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How do I put the text frim the excel file into the fprintf statement without using their actual names
This may not entirely answer your question, but hopefully it points you in the right direction. Suppose you have a vector of wee...

7 years ago | 0

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I have a gui and i want to have 4 buttons to pan my graph so one that goes left right up and down, how would i do this?
The easy answer: I would suggest using the built-in pan tool in the figure toolbar. The slightly more complicated answer: Try...

7 years ago | 0

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Syntax for modifying 'LineWidth' in graph?
If you have a figure, figure; % something plotted here... ax = gca; %axes handle Then to change the line width of ...

7 years ago | 0

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How do I generate a random number between two numbers, "n" number of times?
Without using a for-loop: a = 0; b = 255; n = 1000; x = a + (b-a).*rand(n,1); will generate n numbers randomly ...

7 years ago | 1

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Plotting the data if all the data point is to be represented by a vertical bar from the x-axis (y=0) to the value of y for that point
y = randi(10,1,10); % generate random data figure; hold on; for ii=1:length(y) plot([ii ii],[0 y(ii)],'b'); e...

7 years ago | 1

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Answered
Plotting the data if all the data point is to be represented by a vertical bar from the x-axis (y=0) to the value of y for that point
bar(y);

7 years ago | 0

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Help converting cell to matrix of doubles (Large matrix)
I think datevec is what you want. d = datevec(data(:,1),'yyyy-mm-dd'); d = d(:,1:3); % if you only want to keep the year...

7 years ago | 0

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How do seperate a string in different strings while not creating new strings for variables
For diversity of answers, here is another option (although I do not claim it is better than other answers!): str = '# Donal...

7 years ago | 2

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Is there a way to reduce the precision of Matlab overall?
Here is a simple way to change the precision of a result: n = 4; % number of desired decimal points x = round(x*10^n)/10...

7 years ago | 1

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Matlab delete's value's from array
Suppose you have an M-by-N matrix (A) of NaNs, 0s, and 1s: M = 3648; % number of rows N = 4; % number of columns A ...

7 years ago | 0

Answered
check if url exists for large files without downloading the file
It seems I stumbled upon a similar approach to Steven, but a few minutes too late! I think this function would do the trick: ...

7 years ago | 0

Matthew Eicholtz

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