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hosein Javan


Last seen: 2 months ago
78 total contributions since 2016

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Answered
Modify value of DC voltage source during a simulation
use "controlled voltage source" instead of DC voltage source. connect your look up table to it and it will do it.

2 months ago | 1

Answered
Solving differential equation in simulink
hello again. this should look like this: by clicking on "Tune" an app opens and tries to first linearize the system and the...

2 months ago | 0

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Answered
Find the value x
you can rewrite the equation in the form of "x^(1/x) = exp(1/exp(1))". this means that if "f(z)=z^(1/z)" then we have "f(x) = f(...

2 months ago | 2

Question


my differential equation general solution form requires very high or low values, exceeding double precision capability, while I know its solution is finite
as a brief explanation, I'm trying to solve a first order bessel equation which is part of a more complicated PDE problem, whose...

2 months ago | 0 answers | 0

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Question


fastest way to apply A\B on each matrix page
I would like to find an efficient fast way for calculating: for i = 1:n X(:,:,i) = A(:,:,i)\B(:,:,i) end where A and B are 1...

2 months ago | 1 answer | 0

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answer

Answered
negative continuous position on vector
how about: k = find(logical(A)); n = length(A); B = 1-k:n-k A = 0 0 0 0 1 0 0 0 B = ...

2 months ago | 1

Answered
Simulink Electrical Op Amps
your method is correct. this image shows a model that has been tested. what is the problem exactly? any error?

2 months ago | 0

Question


how to make symbolic computations fast?
hello, I'm working on some calculation that requires great precision at very large or small values. as I have searched the only...

2 months ago | 2 answers | 0

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answers

Answered
Loading a cell array (string) with different lengths into a for loop
you don't even have to concatenate them to one "control" cell array. I suggest create an array called folder where each element ...

3 months ago | 0

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Answered
index multiple columns together on different critera
A= [0.09 0.48 0.5 0.1 0.04 0.3]; idx1 = A(:,1)<0.2 ; idx2 = A(:,2)>0.2; B(:,1) = A(idx1,1); B(:,2) = A(...

3 months ago | 0

Answered
Concatenate x amount of matrices
after a few (or maybe a lot!) thinking, I found the pattern. I used symbolic to specify each element by its name rather than val...

3 months ago | 0

Answered
How to extract RGB matrices from stacked TIFF file?
not sure. % A = your matrix after reading the image file im = cell(1,n); for i = 1:N im{i} = A(:,:,:,i) % im{i} = indivi...

3 months ago | 0

Solved


Determine whether a vector is monotonically increasing
Return true if the elements of the input vector increase monotonically (i.e. each element is larger than the previous). Return f...

3 months 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...

3 months ago

Solved


Triangle Numbers
Triangle numbers are the sums of successive integers. So 6 is a triangle number because 6 = 1 + 2 + 3 which can be displa...

3 months ago

Solved


Column Removal
Remove the nth column from input matrix A and return the resulting matrix in output B. So if A = [1 2 3; 4 5 6]; ...

3 months ago

Solved


Select every other element of a vector
Write a function which returns every other element of the vector passed in. That is, it returns the all odd-numbered elements, s...

3 months ago

Solved


Determine if input is odd
Given the input n, return true if n is odd or false if n is even.

3 months ago

Solved


Add two numbers
Given a and b, return the sum a+b in c.

3 months ago

Solved


Find the sum of all the numbers of the input vector
Find the sum of all the numbers of the input vector x. Examples: Input x = [1 2 3 5] Output y is 11 Input x ...

3 months 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...

3 months ago

Solved


Times 2 - START HERE
Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y. Examples:...

3 months ago

Answered
A function that outputs multiple plots?
function plotoutput() x = 1:10; y = x.*x; plot(x,y) when you call the function, it shows a figure.

3 months ago | 0

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Answered
How to create a loop on matrix
for example suppose we want to multiply each column by its coulmn number: A =[ 92 99 1 8 15 67 74 5...

3 months ago | 0

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Answered
Logarithmic scale with a different base
add the following after plot ax = gca; % current axe ax.XTick = 6:14;

3 months ago | 0

Answered
how can i vary the frequency of the signal
A=240; d=6; x=0:1e-4:1; s=x.^3; a=-(s.*d); minfreq = 10; % minimum frequency(Hz) maxfreq = 200; % maximum frequency(Hz...

3 months ago | 0

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Answered
sum some values of a column based on an other column
% A is the matrix sized: 8784*2 idx1 = A(:,1)==1; idx2 = A(:,1)==2; idx3 = A(:,1)==3; data = A(:,2); sum(data(idx1)) % ...

3 months ago | 1

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Answered
How do you set the first column of a 4x4 matrix = a vector
X = [380 250 220 200] C=[1257 679 220 203 1567 155 234 432 2345 445 238 556]; C(1,:)=X; % set the first row of C equ...

3 months ago | 0

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Answered
no plot appearing for loop
"f" was scalar rather than vector. some constants needed to be defined outside of the loop. and the iteration-depandant variable...

3 months ago | 0

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