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# Kevin Phung

187 total contributions since 2018

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Problem with my code?

2 months ago | 0

how to cancel an account mathworks?
here: https://www.mathworks.com/support/contact_us.html

2 months ago | 0

I don't want to repeat these , I want to use a loop for it
perhaps instead of defining 10 variables or dynamically creating them in a for loop, you can store each matrix of zeros as a cel...

2 months ago | 0

How can i create a new matrix that equationally depends on another matrix?
Here's a potential solution: gear = zeros(1,numel(v)); % initialize gear array gear(and(v>=0,v<25)) = 1; %logical indexing g...

2 months ago | 0

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How do I create a random matrix of numbers with 2 unique positions?
start_pt = [1 3]; % first row, third col end_pt = [5 1]; % fifth row, first col M = rand(5); %5x5 random map M(start_pt(1),s...

2 months ago | 0

Finding a Number in a random array
How would I use Matlab to find the number in the fourth row and sixth column? p1pA=magic(7); p1pA(4,6) %The syntax is p1Pa(r...

2 months ago | 0

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Why Input function error?
You probably have a variable that you named 'input'

2 months ago | 0

How do I plot outside temperature versus time in Matlab?
no for loop needed. Tmax = 310; Tmin = 298; t=(1:24)'; % transposed if you want a column vs row T = ((Tmax - Tmin)/2) + (...

2 months ago | 0

Add a row of zeros at the end of the matrix
x = [23;34;15;19]; new_x = [x zeros(size(x))]

3 months ago | 0

Need help with 1/ matrix in problem
you're going to need the dot operator (.) for element-wise operations. Probably something like this: syms dh eqn2=log(p_rng)...

3 months ago | 1

How to find the (x,y) combinations that make z=0?
Correct me if I am misinterpreting your goal: You have a function z(x,y). You are trying to find the values of x and y that gi...

3 months ago | 0

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How can i get sub matrices with using for loop
you can store each unique value in a cell array: A_unique = unique(A); A2 = cell(size(A_unique)) for i = 1:numel(A_unique) ...

3 months ago | 0

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list box string isn't updated after changes
it gets removed because of the way you are building your string. low=1:Lvalue; low1=num2str(low'); high=Value:50; high1=num2...

3 months ago | 0

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How to add 0 in a column to form an array in which all columns are with equal rows?
here is an example: a = [1 2 3]'; b = [1 2]'; c = [1 2 3 4 5 6 7]'; sets = {a,b,c}; % let a, b, and c be your column sets. ...

5 months ago | 0

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Check for column in table
any(ismember(Table_1.Properties.VariableNames,'Column1')) strcmp works too, in place of ismember

5 months ago | 0

Find all lines of a matrix which have a matching pair of values
A = [1 2 3 4; 2 5 7 8; 4 5 7 9; 4 6 7 13; 6 8 13 15]; Pairs = [5 7; 4 7; 6 13]; index =zeros(size(Pairs,1),1); for i = 1:size...

6 months ago | 0

compare the elements of multiple matrix and return min and max matrix
A = [1 92 33; 4 15 66; 16 27 48]; B = [34 45 16; 67 38 19; 2 83 31]; C = [20 53 61; ...

6 months ago | 1

How to sum up multiple vectors, element by element, to recieve one final value?
example: W = [1 2 3 4 5]; O = [1 2 3 4 5]; %do the numerator first: E = W.*O; %element wise product %sum up the produ...

6 months ago | 1

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Array Operation with using another array
sum(k(m))

6 months ago | 0

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Question

How to Re-position DataCursormode 'Window'
So Matlab figures have a datacursormode that either show up as a datatip or a window. I would like to make use of the window bu...

7 months ago | 1 answer | 0

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Count number of elements in a matrix more or less than given numbers
x = 10; y = 20; sum(A(:,2)<x | A(:,2)>y)

7 months ago | 1

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Replace largest elements in matrix with NaN
A =[17 2 5 68 79 28 900 17 77 63 90 87]; n = 3; elem = sort(A(:,1),'d'); elem =...

7 months ago | 1

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Plot using same colors
To plot in a specific color, scroll down in : https://www.mathworks.com/help/matlab/ref/plot.html so you can do something like...

7 months ago | 0

Find if max elements in array < or > a given number
a = [6 7 4 8 9]; val = numel(a); if sum(a >= val) > val/2 disp(['Max elements greater than or equal to: ' num2str(val)]);...

7 months ago | 1

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What's the best way to shorten this?
a for loop! https://www.mathworks.com/help/matlab/ref/for.html

7 months ago | 1

How to use windowkeypressfcn
function keyP(source, event) KeyPressed=event.Key; if strcmp(KeyPressed,'escape') view(3) end end It's as the error ...

7 months ago | 0

Why won't this program run?
STEPS = 100; tau = 10; t0 = 2*tau; dt = 1; t = [0:STEPS-1]*dt; gE = zeros(1,STEPS); for i = 1:STEPS a = dt*ST...

7 months ago | 0

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How to get a single value of an array through a function inside a script?
function Eg = Esrc(u,a) a = dt*u; %% I want to use the a that is defined above in the code. fo...

7 months ago | 0

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Question

How to find installation folder for matlab add-ons via command line?
Hi, I have a gui (made through a class method, in a class folder) that on start up checks whether or not the user has a specific...

7 months ago | 0 answers | 1

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Updating variable matrix values to static boxes in GUI !
make sure your function main_file_run() actually has an output, so in that function: function x = main_file_run() % blah blah...

7 months ago | 0