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Find the sum of all the numbers of the input vector
Find the sum of all the numbers of the input vector x. Examples: Input x = [1 2 3 5] Output y is 11 Input x ...

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finding the distance between two points
To identify the distances between the nodes of a segment you first need to identify the nodes that make up that segment. Once yo...

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How to calculate repeated calculation using LOOP?
Note that you can add data (e.g. a .mat file) to your question using the paperclip symbol. Without it is is difficult to validat...

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Creating rainbow coloured plots in 3d
This can be done with the patch command, see below for a demonstration numPoints = 100; % create a random line Grid = zeros...

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What are the obs values in this spherical surface equation?
I added some comments in the code below. % define the center of the sphere (i.e. the location of the centroid of the sphere) c...

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How to automatically run all matlab files in a folder
something like this should work folder = 'YourFolder'; mfiles = dir(fullfile(folder, '*.m')); % loop over the files for k ...

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How do I plot the relative error for each iteration vs. iteration number?
Hey, you need to save the value in order to plot it. I added an extra variable (ea_plot) to achieve this, see below. A = [4 1 2...

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Periodically fill scatter3
you can use the 'hold on' command to preserve the figure and add information to it, see below for an example % create an empty ...

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How do I create a matrix from another matrix excluding values?
Hi, see below for a two step procedure to do this. Example = [ 5 0 2022 820 7 1 820; 5 1 2022 813 4 9 805; 5 2 2022...

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For loop only working/filling cell array for half of data
One issue was the reuse of the variable name "x" directly after entering the loop, you overwrite your orinal data by removing el...

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How to pull data from a table from a file and use as a string or cell.
Hi Terry, See below for one example on how to do this. This idea is to first use some logic operators to determine if the code ...

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Why do i keep on getting error 'Not enough input arguments' on calling the function?
See below for the modified version. There were two issues: You need to call the function with two inputs: the array and the in...

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for loop skipping an iteration
I would use a separate variable for the for-loop. See below with the adjusmtents. n = [10 100 1000]; for i = 1:numel(n) ...

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How to do vector loop equation?
The syntax for the solve function works a bit different, see below for a demonstration. Notice that if you have a set of two eq...

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How to combine 2 function handles of different variables?
You need to add the input parameter in order to evaluate the functions. See below for demonstration using some random inputs. Y...

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Extracting survey data from individual files and combining
I used the text files from your comment to update my answer, to (hopfully) better fit it to what you are looking for. I was not...

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fprintf two 3x1 matrix's w/ text
Make sure that you add an end of line character "\n" to the end of the fprintf statement, otherwise evrtything will be printed o...

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Change file from equipment to .txt files
This would do the trick, see below for some comments. % Enter the directory to search directory = uigetdir(); % List all item...

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I tried plot a 3d animated but it doesn't work.
I think you want to use scatter3 and not plot3. See below for a demonstration, i commented some line to run it in the browser (w...

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How di I make concise multiple parameter calls?
One way to do this is by storing the data (or params as you call them) in a cell array, see below for an example. MyString = ['...

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Index in position 1 exceeds array bounds (must not exceed 7).
I indicated in your script where the issue lies, in short: P is a 7x2 matrix. when kk == length(k), it means that k(kk) = 7 ...

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3D point plotting
you can use the plot3 function to plot a 3D line, see below for a demonstration. L1 = 26; R1 = [16 ;17 ; 19 ;25 ;26 ; 27 ; ...

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How do you change the asterisks in the first string to the characters in the same positions in the second string?
See below for one method. string1 = 'v**de***t'; string2 = 'eolehmors'; % find location of the asterisks idx = string1 == ...

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How to display only few values in a plot rather than for whole points in a big array?
See below for a demonstration, i had to assume some parameters. However the plotting princaple remains the same. % these parame...

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Join two table variables into one. == does not works of table type
I think one of the issues is the nan in the data, the result of nan == nan is something for philosophers :) Anyhow, see below f...

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How to get all positive values in following code
Im modified the code a bit, see below for the adjustments and some coments in the code. I stored the T values along with the i ...

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displaying images in random order using 'imread' function
one method could be the following: % number of images numImg = 4; % random permutation of the integers 1:numImg imgIdx = ran...

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formula for changing the base of a logarithm is: loga(N) = (logb(N))/(logb(a)) (a) Use MATLAB's function log (x) to calculate log4(0.085)
You can create a function handle to eval the desired base: log4_fun = @(x) log(x) / log(4) log4_fun(0.85)

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Efficient submatrix product computation
Do note that a for loop can be very efficient. I'm not sure the single line methods will always be faster. Below you can find o...

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Adding parameter to file name string when saving a figure using savefig or figsave
Do you mean savefig? See below fo a method to create the filename as you indicate and a demo to save and open the figure. CHANN...

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