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1. For x from 1 to 100, calculate y. Use fopen and fprintf to write x and y data into a file named “my_data.txt”. Then use fopen and fscanf to read the data. Show the data in two columns. Function to be used: y = e^(0.02x)
Please don't post homework problems without showing your attempts and asking specific questions. I'm feeling generous, though, s...

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[DISCONTINUED] MATLAB Answers Wish-list #5 (and bug reports)
Add a set of pre-written comments for common situations. Things like: "this is clearly a homework problem, please display some ...

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Monthly Average from Daily Data
See findgroups for taking the mean based on a grouping variable. See month for converting a datetime variable to its month See...

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How to vectorize this code?
frequency=randi([0 578],110,1); axis=[-275:5:270]'; % get indices where axis is negative axis_negative = (axis<=0); % calcul...

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how to use for loop to compute a matrix
Assuming each one produces a 25 x 12852 dist array, you can do this fairly easily. Which dimension do you want to concatenate on...

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Access data in a nested structure array and generate an excel file
[Edited with fixed answer, x2] This throws no errors and appears to produce a correct excel file from your sample data: files ...

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How to write a function which handles strings?
Live editor functionality changes a lot across versions, but my suggestion would be to put your function in a separate cell from...

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How to create a custom colormap in this case?
That is essentially the example here. Using the hex -> rgb converter from this answer: % test image imagesc(rand(10,10)) col...

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Is there any way to output coordinates of a point?
If you want to get the data for an arbirtrary point in your graph, you can add a datatip by clicking with the cursor, then right...

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Add various horizontal lines to a plot Matlab 2016a
See here for a few solutions: https://www.mathworks.com/matlabcentral/answers/2031-adding-vertical-line-to-plot

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Scatter Plot only Non-Zero Set of Points
Here's how to do this with a small example script: % create a 5x2 array of random integers 0-5 for both x and y x = randi([0 5...

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Operate on all the columns of a matrix
"N = normalize(A,dim) returns the z-score along dimension dim. For example, normalize(A,2) normalizes each row." norm_mat=norma...

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How to make only some part of a y axis label italic? (in boxplot?)
Set the tick label interpreter to tex: ax=gca; ax.TickLabelInterpreter = 'tex'; or set(gca,'TickLabelInterpreter','tex')

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How to find the min, max and mean values of 34 timetables stored in a 1 x 34 cell and add them as extra columns to the respective timetables?
Is this what you want to do: Load in a given table (say jj=1) create TT2{1} find the min of TT{1}.temperature add a third co...

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How can I set a discontinuous colormap and colorbar range?
Potential solution: Shift the data into a continuous range, then relable the colorbar: cont_data = mydata; % move [351 - 360 ...

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Summation of numbers using prompts
Two errors: The function should not have n as an argument. Wait to ask the user don't use "sum" as a variable name; it's a fun...

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How to compare strings within a loop
No need to loop, strcmpi will compare a string to all strings in an array. If you don't care which string matches, use "any": s...

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I have a timetable with 10 columns that are all binary and I want to add them together so I get a sum of those binary numbers for each row. Is there an easy way to do this?
% example table mytable=array2table(randi([0 1],20,10)); % create column variable with sum sum_all = sum(mytable{:,1:10},2); ...

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Plot Problem in Matlab
Assuming you have edited the matlabrc, it may be as simple as you having a scalar logical operator (&&, ||) instead of an elemen...

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Modifying a function for the trapezoidal rule to work with a data set instead of an equation?
My suggestion is to check out the built-in trapz function. There are a few formulas there that should help. Another note: your ...

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how to preserve original column headings (variable names) when using writetable
As of 2019b, table variable names don't need to follow normal variable naming rules. This allows for a couple of fixes: T = rea...

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How can I change the size of the text in annotation, and place a border around it?
You are setting the width and height of the box to 0. I believe this should do it, but check here for other properties you may ...

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Creating a Tabular Legend
Not a good solution, but with some fiddling gets pretty close: myleg=compose('%-8s%10d',["Boot";"Engine";"Wheel"],[1 3 5]'); m...

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Change meshgrid face color
surf(Ltm, Lnm, Pm,'FaceAlpha',0.5) to set transparency to 50%. See other options here

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Read string from files since R2020a
From the release notes: "As of R2020a, character-oriented file I/O functions such as fscanf, fgets, and fgetl trigger automatic...

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Adding a categorical column to a Table
In one line: mytable.mycategories = categorical(repelem({'v';'a';'i'},[68,32,55])); To explain: Matlab will add a column if...

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Selecting particular data range from table/ columns
idx = (mytable{:,2} >= 15) & (mytable{:,2} <= 50); newtable = mytable(idx,1:2); Components of the answer: extract the data ...

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Resuelto


Sum all integers from 1 to 2^n
Given the number x, y must be the summation of all integers from 1 to 2^x. For instance if x=2 then y must be 1+2+3+4=10.

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Magic is simple (for beginners)
Determine for a magic square of order n, the magic sum m. For example m=15 for a magic square of order 3.

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Make a random, non-repeating vector.
This is a basic MATLAB operation. It is for instructional purposes. --- If you want to get a random permutation of integer...

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