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Alex Mcaulley


232 total contributions since 2019

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Answered
Exporting data from matlab to a excel with a special pathway
xlswrite(filename,Y1,1) xlswrite(filename,Y2,2) xlswrite(filename,Y3,3)

13 days ago | 0

Answered
How do I code a function that's supposed to be an infinite pattern?
Another possibility: res = sum(x.*circshift(y,-1) - y.*circshift(x,-1))

13 days ago | 0

Answered
Best way to calculate the determinants of a series of matrices?
delta = arrayfun(@(t) det(squeeze(G(t,:,:))),1:size(G,1));

17 days ago | 0

Answered
what is the error in this program
There is no error in your code, the problem is that it doesn't do whatt you want. I guess you want something like this (without ...

17 days ago | 0

Answered
Errror using imwrite, can't use "append" in 'WriteMode'
You are changing the file name for each frame, resulting in different tif images. To build a tif stack you just need to use ONE ...

17 days ago | 1

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Answered
How to generate a random integer between two bounds?
randi([4,500])

18 days ago | 0

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Answered
i want to plot 4 plots using ginput
Adding hold on: clear all; close all; hold on for k=1:4 axis([0,10,0,10]); data = ginput(4); x = data(:,1); y = data(:,2...

25 days ago | 0

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Answered
Summing up values of A matrix if it matches the same value in B
One option: [G,ID] = findgroups(B); C = [splitapply(@sum,A,G),ID] C = 15.0000 32.1111 3.0000 34.6731 1.0000...

26 days ago | 0

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Answered
Problem in plotting the string variable
Do you mean this? Rough_y=[4;5;8;3;12;14;9;11;17;17;11;14;19;25;15] Station=['a';'b';'c';'d';'e';'f';'g';'h';'i';'j';'k';'l';'...

27 days ago | 0

Answered
How can i use Inverse for symbolic variables?
syms x y a b c d A = [ a*(x^2) , b*(y^3) ; d*(x^2)*y , c ]; inv(A) ans = [ c/(- b*d*x^2*y^4 + a*c*x^2), -(b*y^3)/(- b*d*x^...

1 month ago | 1

Answered
problem with reading data from excel
Do you mean this? data = xlsread('yourExcel.xlsx'); data = data(2:end,2:end) data(2,4) %For example: x1 = 2; x2 = 4

1 month ago | 0

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Answered
Checking for existence of row in a matrix
Try with this: my_mat = [1 2 4 5 3 1 6 9 7]; new = [6 9]; Lia = ismember(my_mat(:,1:2),new,'rows'); ...

1 month ago | 0

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Answered
How to repeat loop until condition is met? While or For Loop?
Something like this would be a good solution: x = %Initialization A = x + 1.5; B = x^2 + 1; Error = A-B; iter = 1; while ...

1 month ago | 0

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Answered
Differentiating gives wrong result
I don't know why the result is presented in different way depending on the case, but the result is allways the same: %Case 1 s...

1 month ago | 0

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Answered
Array indices must be positive integers or logical values
You are trying to acces to: B(0), B(0.1) and so on, which are not allowed indexes. Try with this: %% MAGNETORQUER SIZING clear...

1 month ago | 0

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Solved


Back and Forth Rows
Given a number n, create an n-by-n matrix in which the integers from 1 to n^2 wind back and forth along the rows as shown in the...

1 month ago

Solved


Is my wife right?
Regardless of input, output the string 'yes'.

1 month ago

Solved


Pizza!
Given a circular pizza with radius _z_ and thickness _a_, return the pizza's volume. [ _z_ is first input argument.] Non-scor...

1 month ago

Solved


Make the vector [1 2 3 4 5 6 7 8 9 10]
In MATLAB, you create a vector by enclosing the elements in square brackets like so: x = [1 2 3 4] Commas are optional, s...

1 month ago

Answered
How can I find consecutive digits seperated by spaces?
An alternative without regexp: a = '1 1 1 4 4 6 7 7 7 7'; b = str2num(a); d = [true, diff(b) ~= 0, true]; n = diff(find(d))...

1 month ago | 3

Answered
How to identify and remove element if it is consecutively repeated a certain amount of times in an array
Following Jan's answer in this threat (link): A = [1 2 3 3 3 3 5 6 2 8 7 3 3 2]; d = [true, diff(A) ~= 0, true]; n = diff(fi...

2 months ago | 0

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Answered
A simple matrix question
sort(A,'descend')

2 months ago | 0

Answered
Sort Matrix based on column of another matrix
C = A(B,:)

2 months ago | 2

Answered
How to run an if statement in a cell?
A possible soution: sol = cellfun(@(in) in > 0.1*mean(in(:)),A,'uni',0); %where A is your cell array

2 months ago | 1

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Answered
Find sum of individual matrix of a given array of matrices and store it in a temporary array
Being M your matrix: sol = sum(sum(M,3),2)

2 months ago | 1

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Answered
How to divide a 4500x4500 matrix into smaller 36x36 matrices?
Try this: a = rand(4500); b = mat2cell(a,36*ones(4500/36,1),36*ones(4500/36,1))

2 months ago | 1

| accepted

Answered
Checking the variable for specific string
function [Y] = butter2filtfilt(x, Fs, Fcutoff, Type) if ~ismember(Type,{'high','low'}) error ('Filter type error') end ...

2 months ago | 3

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Answered
[Help] Undefined function or variable 'Reference'. On Running a .m script file.
The name of your script "Reference-EPD-Project-v4" is not a valid name for a function/script. Are you sure that this is the name...

2 months ago | 0

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Answered
How can I break this while loop and store the data?
Try with this: n = 7; iter = 1; seq(1) = n; %where the sequence is stored while n > 1 if mod(n, 2)==0 n = n/2;...

2 months ago | 1

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Answered
Create new variable using if function from existing array variables
Try this: PMIdata.AboveMA = PMIdata.PMInum > PMIdata.PMIave;

2 months ago | 0

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