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madhan ravi


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4,220 total contributions since 2018

Communication through MATLAB is always better than arguing.

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Answered
Undefined function or variable 'imnlmfilt'
It requires Image Processing Toolbox and a valid license for it. Contact your IT department in your University to get the licens...

19 hours ago | 0

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Answered
Solving symbolic trig equation in terms of theta, using "sol."
The solution is returned in a struct so to access it you need to use the dot. It has occurred that there are two solutions?

1 day ago | 0

| accepted

Answered
How to convert a char into double?
sscanf(f,'%d')

2 days ago | 0

Answered
lines through markers on legend
x = -10 : 0.1 : 10; y = cos(x); plot(x, y, '--o', 'MarkerSize', 5) hold on y = sin(x) plot(x, y, '--d', 'MarkerSize',...

2 days ago | 1

Answered
How to create function handle with matrix inputs, vector output?
FCN = @(x) x(:, 1) + x(:, 2); sum(in, 2) % ??

3 days ago | 0

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Answered
"str2sym" delete the element wise operation
doc matlabFunction

3 days ago | 1

| accepted

Answered
How to replace multiple elemets at particular index in vector ?
a(3 : 2 : 7) = [.7, .1, .9]

3 days ago | 1

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Answered
extract num and den from matrix transfer function
Use it inside the loops, preallocation is recommended for the variables.

3 days ago | 0

Answered
How can i get the last element of a maxium with the help of findpeaks?
<https://www.mathworks.com/help/signal/ref/findpeaks.html#bufhxsk-2> It states: _“For the flat peak, the function returns ...

3 days ago | 0

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Answered
Error 'Array indices must be positive integers or logical values.' when the number of indices is large
In this case it’s probable that b has elements less than 1 and greater than 32. Outside_bounds = nnz((b < 1) | (b > 32)) % t...

5 days ago | 0

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Answered
fzero or fplot function
The anonymous function should perform element wise operations (warnings for fplot) and (errors for fzero).

5 days ago | 0

Answered
How parentheses effects multiplication with pi ?
In the first the order of operation is from left to right. In the second the order of operation is inside the parenthesis and...

5 days ago | 0

Answered
How do I delete my account?
Contact MathWorks Support Team.

6 days ago | 0

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Answered
how to label strings in an array with an ID
T = cell2table(StringID(:, 2)); T.Properties.RowNames = StringID(:, 1); Wanted = T{num2cell(tc), :}

6 days ago | 0

Answered
Error while plotting matrix of complex numbers
plot(real(sub), 'r-', imag(sub) ,'b*');

6 days ago | 0

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Answered
Variable for loop storage
low = A(lowPs, :)

6 days ago | 0

Answered
Variable for loop storage
low = cell(numel(lowPs), 1); for k = 1 : numel(lowPs) B = A(:,1) == lowPs(k); %%row numbers in A where A(:,1) that co...

6 days ago | 0

| accepted

Answered
random matrix with a given number of specified elements
v = [repelem(1, 5), repelem(0, 4)]; Wanted = v(reshape(randperm(numel(v)), 3, []))

7 days ago | 1

| accepted

Answered
How can I randomize the order of a matrix of images
Filenames = compose('image%d.png', 1:4); Filenames(randperm(numel(Filenames))) % ?

7 days ago | 0

Answered
Using Surf function with matrix
surf(C)

8 days ago | 0

Answered
Plotting in 3d
doc fsurf

9 days ago | 0

Answered
wrong differential equation solution
a1 = matlabFunction(simplify(sol)); a = matlabFunction((1/80)*(36*exp(-t)-35*cos(t)-cos(3*t)+125*sin(t)-3*sin(3*t))); t ...

9 days ago | 1

Answered
Livescript: equation number
No, the workaround would be to use section titles.

9 days ago | 0

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Answered
Why does the second matrix start with zeros?
MATLAB assigns zero to the previous indices, for better understanding: clear a a(11) = 1; % now you will see elements fro...

9 days ago | 1

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Answered
How to remove array items that include a certain substring?
v = regexprep(filetable, '^[a,b].*', ''); v(cellfun('isempty', v)) = []

10 days ago | 0

Answered
Problem about rounding to 0
w = u_1 * u_2 - u_3 * sym(u_4) Click on the tag floating-point.

10 days ago | 1

Answered
How can I get maximum and minimum value with sym variables
Use matlabFunction() and fminbnd() to find the minimum value of that function and to find the maximum extreme use negative sign ...

10 days ago | 0

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Answered
Sorting a matrix using it's index
Asort2 = A(sub2ind(size(A), repmat((1:size(A,1)).', 1, size(A,2)), idA))

10 days ago | 0

Answered
How to reshape matrix 2 columns by 2 columns
First = matrix(:, 1:2:end); Second = matrix(:, 2:2:end); Wanted = [First(:), Second(:)]

10 days ago | 0

Answered
SUBS function not working properly - R2020a
double(val) %or vpa(val)

11 days ago | 0

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