Community Profile # hosein Javan

Last seen: ongeveer 2 jaar ago Active since 2016

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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.

ongeveer 2 jaar ago | 1

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...

ongeveer 2 jaar ago | 0

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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(...

ongeveer 2 jaar 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...

ongeveer 2 jaar 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...

ongeveer 2 jaar ago | 1 answer | 0

### 1

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 = ...

ongeveer 2 jaar ago | 1

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

ongeveer 2 jaar 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...

ongeveer 2 jaar ago | 2 answers | 0

### 2

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 ...

ongeveer 2 jaar ago | 0

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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(...

ongeveer 2 jaar ago | 0

I am not able to integrate heaviside(y-f) for x= 0 to pi/2 and y = 0 to pi/2 (only syms integration "int"). After running the code, output is shown in below and i am not able to get the numerical answer. Can you give some ideas on how to proceed?
if you need numerical integration, some functions cannot be easily evaluated by symbolic. instead use "integral". in here we hav...

ongeveer 2 jaar ago | 1

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...

ongeveer 2 jaar ago | 0

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...

ongeveer 2 jaar 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...

ongeveer 2 jaar 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...

ongeveer 2 jaar 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...

ongeveer 2 jaar 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]; ...

ongeveer 2 jaar 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...

ongeveer 2 jaar ago

Solved

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

ongeveer 2 jaar ago

Solved

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

ongeveer 2 jaar 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 ...

ongeveer 2 jaar 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...

ongeveer 2 jaar 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:...

ongeveer 2 jaar ago

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.

ongeveer 2 jaar ago | 0

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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...

ongeveer 2 jaar ago | 0

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

ongeveer 2 jaar ago | 0

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...

ongeveer 2 jaar ago | 0

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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)) % ...

ongeveer 2 jaar ago | 1

| accepted