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Alex Mcaulley


223 total contributions since 2019

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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^...

3 days 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

6 days 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'); ...

6 days 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 ...

12 days 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...

14 days 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...

14 days 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...

17 days ago

Solved


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

17 days 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...

17 days 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...

17 days 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))...

17 days 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...

19 days ago | 0

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

21 days ago | 0

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

21 days 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

21 days 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)

21 days 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))

24 days ago | 1

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

25 days 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...

26 days 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;...

26 days 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;

27 days ago | 0

Answered
how to find complex polynomial solution
Then, after defining all the constant values: syms w CDP1 = T_6*(1i*w).^6 + T_5*(1i*w).^5 + T_4*(1i*w).^4 + T_3*(1i*w).^3 + T_...

27 days ago | 0

Answered
saving with variable name
function myfun(filename,C) save([filename '.mat'], 'C'); end

27 days ago | 0

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Answered
could anyone please help me solve the matrices with respect to the equation as follows:
For i == 3: X3 = V(3)*U(2)-U(2)*sum(V(1:2))

27 days ago | 0

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Answered
How can I fill between two curves, but only when one curve is above the other?
You can do a little trick: plot(x,y1,'k',x,y2,'k:'); hold on; xlim([x(1) x(end)]); y1tmp = y1; y1tmp(y1<y2) = y2(y1<y2); j...

1 month ago | 0

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Answered
Why my 'bboxes' and 'scores' variables are all empty while certainly my image contains a person?
Have you tried changing the peopledetector properties? For example, you get a result just changing the model: peopleDetector = ...

1 month ago | 0

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Answered
Solving Equations with inputs from an Excel file
I suspect you have an overdetermined system (1 variable and 24 equations). Probably you want this: %% Energy balance Top layer ...

1 month ago | 0

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Answered
Retrieve commands from .mat file
.mat files only store variables from the workspace. To retrieve command history: https://es.mathworks.com/matlabcentral/answer...

1 month ago | 0

Answered
Remove duplicate rows in CSV file
Since all is numeric data, you can use: data = xlsread('kdd.xlsx'); datanew = unique(data,'rows');

1 month ago | 1

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