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hosein Javan


Last seen: nästan 4 år ago |  Active 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.

nästan 4 år 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...

nästan 4 år 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(...

nästan 4 år 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...

nästan 4 år ago | 0 answers | 0

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answers

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...

nästan 4 år 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 = ...

nästan 4 år 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?

nästan 4 år 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...

nästan 4 år ago | 2 answers | 0

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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 ...

nästan 4 år ago | 0

| accepted

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(...

nästan 4 år ago | 0

Answered
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...

nästan 4 år ago | 1

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...

nästan 4 år 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...

nästan 4 år 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...

nästan 4 år 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...

nästan 4 år 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...

nästan 4 år 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]; ...

nästan 4 år 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...

nästan 4 år ago

Solved


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

nästan 4 år ago

Solved


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

nästan 4 år 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 ...

nästan 4 år 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...

nästan 4 år 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:...

nästan 4 år 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.

nästan 4 år 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...

nästan 4 år 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;

nästan 4 år 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...

nästan 4 år 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)) % ...

nästan 4 år ago | 1

| accepted

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...

nästan 4 år 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...

nästan 4 år ago | 0

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