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hosein Javan


Last seen: ungefär 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.

ungefär 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...

mer än 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(...

mer än 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...

mer än 4 år ago | 0 answers | 0

0

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...

mer än 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 = ...

mer än 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?

mer än 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...

mer än 4 år ago | 2 answers | 0

2

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 ...

mer än 4 år 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(...

mer än 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...

mer än 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...

mer än 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...

mer än 4 år ago | 0

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.

mer än 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...

mer än 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;

mer än 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...

mer än 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)) % ...

mer än 4 år 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...

mer än 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...

mer än 4 år ago | 0

Answered
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. ...

mer än 4 år ago | 0

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Answered
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...

mer än 4 år ago | 1

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Answered
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...

mer än 4 år ago | 0

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Answered
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...

mer än 4 år ago | 0

Answered
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...

mer än 4 år ago | 0

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Answered
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)...

mer än 4 år ago | 0

Answered
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...

mer än 4 år ago | 0

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Answered
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 ...

mer än 4 år ago | 0

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Answered
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...

mer än 4 år ago | 0

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Answered
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...

mer än 4 år ago | 0

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