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How to read the data from .txt file and plot?
Read the error message and follow its advice to use curly-brace subscripting rather than parentheses: data = readtable('rans1_d...

5 years ago | 1

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Answered
How to insert data to a matrix based on index values stored in a matrix?
a = randi(9,7,5) b = [2,2,3,1,2;6,5,7,6,5] rwv = 1:size(a,1); idx = rwv(:)<=b(1,:) | rwv(:)>=b(2,:); a(idx) = NaN If you ar...

5 years ago | 0

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Answered
How to read in more rows to a cell array from a text file?
This would be easier if each block used an integer instead of "First", "Second", etc. By far the best would be leading text foll...

5 years ago | 1

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Answered
Create a matrix with elements clockwise
More efficient: M = spiral2(5,8)

5 years ago | 1

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Answered
Why does my V returns a single scalar value?
You are using the wrong divide operator: V=(P*x.^2).*(3*L-x)./(E*I) % ^^ https://www.mathworks.com/help/matl...

5 years ago | 0

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Answered
Sorting Column Variable to a Row
Do NOT use loops for this, the inbuilt tools are much better! First lets create some fake data in a table: C = randi(6,30,1); ...

5 years ago | 0

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Answered
Concatenate 2D matrices into one 3D matrix with for loop
C = struct2cell(data); A = cat(3,C{:}); https://www.mathworks.com/help/matlab/matlab_prog/comma-separated-lists.html https://...

5 years ago | 0

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Is there a way to find number of blocks in a matrix?
Assuming that the blocks do not contain zeros: A = [1,2,0,0,0,0,0,0,0;3,4,5,6,0,0,0,0,0;0,7,8,9,0,0,0,0,0;0,1,2,3,4,5,0,0,0;0,0...

5 years ago | 0

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Answered
Arrange array elements in 1st column w.r.t corresponding values in 2nd column
A = [1,9;1,14;3,11;5,13;7,15;9,17;11,19;14,21] B = myfun(A) function out = myfun(inp) out = []; while numel(inp) vec ...

5 years ago | 0

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Answered
Find order of increasing integers
V = [3,4,8,9,10,13]; D = diff(find([true,diff(V)~=1,true])); C = mat2cell(V,1,D)

5 years ago | 0

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Answered
How to specify index variable name of for loop programmatically?
"Is there a cleaner way to rethink this problem?" Of course. Using MATLAB effectively means using arrays and indexing. Note th...

5 years ago | 1

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Answered
Understanding the difference between ndgrid and meshgrid (from Numpy)
If you must replicate numpy.meshgrid (with the default indexing='xy') then do not use ndgrid, unless you want to waste time perm...

5 years ago | 1

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Answered
Find only numeric strings on cellstr array.
Writing regular expressions or pattern matching that robustly detects all valid number formats is not such a trivial task... it ...

5 years ago | 1

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convert an array of 0s and 1s to binary & reverse
B = [0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1]; D = pow2(7:-1:0)*reshape(B,8,[])

5 years ago | 1

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How I can detection column indexes of string 'rn_mill_tonnage' (n=1,2,3,4....)
C = {'X','Y','Z','size(X)','size(Y)','size(Z)','volume','r1_cu_mill_grade','r1_mill_tonnage','r2_cu_mill_grade','r2_mill_tonnage...

5 years ago | 0

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Answered
I am unable to understand the use of ~ here.I know that find peaks returns two arguments x and y axis of peak
https://www.mathworks.com/help/matlab/matlab_prog/ignore-function-outputs.html In both of the examples you show, the code's aut...

5 years ago | 0

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error in my code
You need to download this FEX submission (by clicking on the big blue "Download button"): https://www.mathworks.com/matlabcentr...

5 years ago | 0

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from C_T_Sep_1 to C_T_Sep_10 they are vectors the same thing for C_A_Sep_1... C_A_Sep_10, I want to create matrix C_T_Sep and C_A_Sep and put the vector inside it, using loop
Your code design makes your task much harder. By forcing meta-data into the variable names, you have forced yourself into writin...

5 years ago | 0

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Answered
get 0 in the end of a regexp function
x = 1.2569e-15; v = regexprep(sprintf('%#.6g',x),{'\.','e.+'},'')-'0'

5 years ago | 0

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extract numbers from cells
Simply download my FEX submission SIP2NUM: https://www.mathworks.com/matlabcentral/fileexchange/53886-scientific-prefix-to-numb...

5 years ago | 0

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how to form a two-column array for a given but dimmension-unknown array?
"I am wondering if there is a simple way to form array C without checking the dimmensions of A and B." C = [A(:),B(:)]

5 years ago | 0

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Answered
How to extract some values from a structure?
Assuming that structure A is scalar (so far you did not tell us this important information): A.x = randi(9,1,100); A.y = randi...

5 years ago | 0

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Answered
Extract data from a cell contains of alphabet and number
"I have read the contents from file and I have a cell which contians 10133x1 cell array. The cell array contains of letter and n...

5 years ago | 0

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Answered
Accessing multiple columns in cell array
Fake data: Data = arrayfun(@(n)randi(9,2,3),1:5,'uni',0).'; % fake data Data{:} Method one: M = mean(cat(3,Data{:}),3); M =...

5 years ago | 0

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Import multiple .txt files by dates from user input
"What would be the best way to approach this?" Your approach of manipulating dates as strings is inefficient because it require...

5 years ago | 0

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Answered
How can I deleate or replace with a 0 all the Nan, Inf anf -Inf values in a time series from the biggining to the end?
Simpler: a(~isfinite(a)) = 0;

5 years ago | 0

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Concatenate variables with similar names
"Using a loop." Then that is where you should fix the bad code design. Meta-data is data, so store it in arrays, not in variab...

5 years ago | 0

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Answered
"Access Elements of a Nonscalar Structure Array" issue
sys = fakedata() fnm = regexp(fieldnames(sys),'^system\d+$','match'); fnm = [fnm{:}] fun = @(f)sys.(f).subsystem.mass; out =...

5 years ago | 0

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Error using conv2 N-D arrays are not supported.
Perhaps you could use convn instead of conv2: I = imread('peppers.png'); lpf1 = 1./[16,8,16;8,4,8;16,8,16]; lpf2 = 1./[10,10,...

5 years ago | 1

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Answered
How can I concatenate vectors based on a grouping label contained by a separate variable?
N = ["charlie_test_a";"charlie_test_b";"charlie_test_c";"jane_test_a";"jane_test_b";"mildred_test_a";"mildred_test_b";"mildred_t...

5 years ago | 0

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