# hosein Javan

**Statistics**

RANK**425**

of 271.658

REPUTATION**162**

CONTRIBUTIONS

**9** Questions

**59** Answers

ANSWER ACCEPTANCE **
44.44%
**

VOTES RECEIVED**13**

RANK

of 18.321

REPUTATION**N/A**

AVERAGE RATING**0.00**

CONTRIBUTIONS**0** Files

DOWNLOADS **0**

ALL TIME DOWNLOADS**0**

CONTRIBUTIONS**0 Posts**

CONTRIBUTIONS**0** Public Channels

AVERAGE RATING

CONTRIBUTIONS**0** Highlights

AVERAGE NO. OF LIKES

**Content Feed**

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.

meer dan 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...

meer dan 2 jaar ago | 0

| accepted

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(...

meer dan 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...

meer dan 2 jaar ago | 0 answers | 0

### 0

answersQuestion

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...

meer dan 2 jaar ago | 1 answer | 0

### 1

answernegative 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 = ...

meer dan 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?

meer dan 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...

meer dan 2 jaar ago | 2 answers | 0

### 2

answersLoading 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 ...

meer dan 2 jaar ago | 0

| accepted

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(...

meer dan 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...

meer dan 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...

meer dan 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...

meer dan 2 jaar ago | 0

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.

meer dan 2 jaar ago | 0

| accepted

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...

meer dan 2 jaar ago | 0

| accepted

Logarithmic scale with a different base

add the following after plot ax = gca; % current axe ax.XTick = 6:14;

meer dan 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...

meer dan 2 jaar ago | 0

| accepted

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)) % ...

meer dan 2 jaar ago | 1

| accepted

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...

meer dan 2 jaar ago | 0

| accepted

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...

meer dan 2 jaar ago | 0

How to add a noise in my Input graph?

this code gives a zero mean noise with a sampling rate equal to your signal. just calculate it's amplitude by knowing variance. ...

meer dan 2 jaar ago | 0

| accepted

Simulink animation for BLDC motors

I didn't see anything about animate in that video. however I propose after running the simulation, save your data including time...

meer dan 2 jaar ago | 1

| accepted

Computing voltage and current amplitude and average power

if they are 3-phase, use clarke transformation. it will give you the amplitude and phase the dividing by sqrt(2) yield the rms v...

meer dan 2 jaar ago | 0

| accepted

Invalid setting for input port dimensions of 'without_statcom/Asynchronous Machine pu Units/Measurements/Demux1'. The dimensions are being set to [-1]. This is not valid because the total number of input and output elements are not the same

hello. you need to set number of elments in Demux1 correctly. when you run simulation look at the input signal it says for examp...

meer dan 2 jaar ago | 0

plot error variables not same length

try this if could resolve the problem. I have selected those elemnts of "y_fft" corresponding to "f" vector. plot(f, y_fft(1:le...

meer dan 2 jaar ago | 0

| accepted

i have a syntax error in u(3)-u(4)(exp((u(2)u(1)+u(6))))/(u(5))-1) what the error ?

you didn't have product sign"*". also there were bunch of incorrect parantheis. copy and paste should work. u(3)-u(4)*(exp(u(2)...

meer dan 2 jaar ago | 0

Image processing: transition between two halves of an image

you must define the dim factor in a way that is 1.between 0 and 1, 2. it has smooth transition. for example here in order t...

meer dan 2 jaar ago | 0

| accepted

vectors problem, como podria unir los vectores

hola, es esto lo que esperas? A = [1 0 0 0 0 1 1 0 1 0 0 1 1 1 1 0 0 0 1 0 1 0 0]; B = [2 0 2 2 2 0 2 0 2 2 0 0 2 0 2 2 0 0 0 ...

meer dan 2 jaar ago | 0

| accepted

ASSISTANCE ON RUNNING RANDOM VARIABLES IN A FUNCTION

I assumed that "y" must not be a constant since you have dy/dt. therefore I made it an input for the function % define your con...

meer dan 2 jaar ago | 0

| accepted

Calculate mean of a matrix columnwise if a condition is met

A = [10 10 10;10 5 5;10 5 5] b = 10 C = b - A C(A>=b) = nan % replace all data out of specified range by nan mean(C,'omitnan...

meer dan 2 jaar ago | 0

| accepted