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Count number of nucleotide bases (letters) in file with multiple entries
% this is what the attached file contains: type file.txt data = readlines('file.txt'); ID = regexp(data(1:2:end),'>(.*?):...

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A simple/efficient way to add one additional xtick, and the corresponding xticklabel, to the existing xticks and xticklabels
plot(1:50) new_tick = 5; ax = gca(); ax.XTick = unique([ax.XTick new_tick]);

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Logging cmd in multiple diary
You can restore diary logging to log1.txt after logger2 finishes: logger1(); function logger1() logName = fullfile(pwd,...

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I am having trouble constructing a 'for loop'. Can you suggest me on how to modify it?
One thing I notice is that (-A)^i-1 should be (-A)^(i-1) EDIT: that's now corrected in the question.

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Reading columns from a poorly-formatted text file
This file looks like a fixed-width file, but it's not quite, because lines 68 and 69 differ in format from the other lines. dbt...

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How to change Fontcolor xticks and yticks
Assuming you just want to change the color of the x-tick and y-tick labels: plot(1:10) ax = gca(); ax.XAxis.TickLabelColor ...

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Increasing the line width of box plot whiskers
findobj('Tag','boxplot') finds all* objects whose Tag is 'boxplot'. This includes any object whose Tag is 'boxplot' anywhere in ...

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I have some code that keeps failing to open and read two csv files out of four. Can someone explain what is wrong with either the code or the csv files
When processing Sample3.csv, post_fun removes every row of table T because index, defined here index = isnan(disp) | isnan(forc...

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keyPressFcn on a figure: wait untill the user is done annotating.
Here is a code structure that you can run and add to. n_fig = 2; keyInfo = cell(1,n_fig); ii = 1; while ii <= n_fig ...

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Scatter data to smooth line plot
load U_Au_T100 XY = Pos_UI1; scatter(XY(:,1),XY(:,2)) C = mean(XY,1); XY0 = XY-C; th = atan2(XY0(:,2),XY0(:,1)); [~,id...

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I need to compare elements that come from different tables
EQID_inter is a numeric array. Bnames_inter.Level is a cell array (whose first element contains the character vector '6000038')...

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Trying to understand how imagesc works compared to scatter.
load('imagesc_confusion.mat') Longitude (xlon) varies first in your data: [xlon ylat meantemp(:)] which means as you go down ...

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How can I add individual error bars to a grouped bar graph plot?
Replace x = reshape([b.XEndPoints],[nGroups, nBars]); with x = vertcat(b.XEndPoints); Example, using random data: x1 = [2.5...

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How to perform a basic division to every x1000 data columns?
load('S.mat') load('spikes_std_mtx.mat') Here is one way: N = size(spikes_std_mtx,2); result = NaN(N,1); for ii = 1:N ...

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Unique function to return last duplicate value
"The data is essentially a ramp up and then a 3 second pause then a ramp down and I want to [split] the data into two variables ...

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Error: unrecognized function or variable "bi2de"
bi2de is a function in the Communications Toolbox; based on the error message you received, I guess that toolbox is not installe...

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Creation of colorbar for given points
% I don't have your image data, so I make % a random matrix to use in imagesc() data = rand(20,20); % read colormap color...

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Plotting random number in a line
If you want to plot points on the x-axis, specify the y-coordinates as zero. X = rand(1,100); Y = zeros(1,100); plot(X,Y,'*')...

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slow drawing of a set of points on a plane
p = [ cos(0:.1:1.9*pi), -1:.2:1, 0*(-1:.2:1) ; sin(0:.1:1.9*pi), 0*(-1:.2:1), -1:.2:1 ] figure plot(p(1,:),p(2,:),'r.') grid ...

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Issues with looping in structure: variable in the name
I guess this is something like your flight_data variable: flight_data = struct('fl',{permute(num2cell(rand(10,9,11),[1 2]),[3 1...

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too many open files even after adding fclose within my for loop
It may be that too many files are still open, coming from previous runs of the code where you did not have the fclose commands y...

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JOIN CVS FILES AND PLOT
fileDir = pwd; % current directory (or specify which one is the working directory) S = dir(fullfile(fileDir,'*.csv')); % get li...

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How to plot Mach Number Contours
Adding the line contourf(x,y,M) to the end of your code produces the following result: %% Initialize datapoint matrices clea...

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Don't understand the reason this code is giving me errors.
You have an extra ")" here: [t,q] = ode45(@(t,r) (G5*p*r-G6*p*p-G6*r*r)+m/Jy), [0 10],0); % ...

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how to change the direction of this code from right falling into left to left falling into right
figure x = 1:10; y = 10:-1:1; for ii = 1:numel(x) plot(x(ii),y(ii),'r.','markersize',40) axis([-1,11,-1,11]) p...

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MEAN OF A VARIABLE WITH RESPECT TO OTHER VARIABLES
https://www.mathworks.com/help/matlab/ref/double.groupsummary.html

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read part of a .txt file
filename = 'file.txt'; str = readlines(filename); C = arrayfun(@(s)sscanf(s,'%f %f %f %f %f %d:%d:%d %f'),str,'UniformOutput...

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read part of a .txt file
filename = 'file.txt'; T = readtable(filename,'CommentStyle','R','NumHeaderLines',0,'VariableNamingRule','preserve'); T(all(...

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How does indexing work when sorting a matrix?
For matrix R, sort(R) sorts each column and indsort are row indices. To reproduce the sorted matrix, you can convert those row ...

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Better way to keep dimensions using reshape from extracted struct array?
load('data.mat') bb = vertcat(myData.data.b)

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