hosein Javan
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Accept 2 answers given by other contributors
Awarded to hosein Javan on 15 Feb 2022
Solve a problem for the first time
Awarded to hosein Javan on 13 Aug 2020
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Feeds
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.
environ 4 ans il y a | 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...
plus de 4 ans il y a | 0
| A accepté
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(...
plus de 4 ans il y a | 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...
plus de 4 ans il y a | 1 réponse | 0
0
réponseQuestion
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...
plus de 4 ans il y a | 1 réponse | 0
1
réponsenegative 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 = ...
plus de 4 ans il y a | 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?
plus de 4 ans il y a | 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...
plus de 4 ans il y a | 2 réponses | 0
2
réponsesLoading 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 ...
plus de 4 ans il y a | 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(...
plus de 4 ans il y a | 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...
plus de 4 ans il y a | 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...
plus de 4 ans il y a | 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...
plus de 4 ans il y a | 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.
plus de 4 ans il y a | 0
| A accepté
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...
plus de 4 ans il y a | 0
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Logarithmic scale with a different base
add the following after plot ax = gca; % current axe ax.XTick = 6:14;
plus de 4 ans il y a | 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...
plus de 4 ans il y a | 0
| A accepté
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)) % ...
plus de 4 ans il y a | 1
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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...
plus de 4 ans il y a | 0
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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...
plus de 4 ans il y a | 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. ...
plus de 4 ans il y a | 0
| A accepté
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...
plus de 4 ans il y a | 1
| A accepté
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...
plus de 4 ans il y a | 0
| A accepté
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...
plus de 4 ans il y a | 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...
plus de 4 ans il y a | 0
| A accepté
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)...
plus de 4 ans il y a | 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...
plus de 4 ans il y a | 0
| A accepté
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 ...
plus de 4 ans il y a | 0
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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...
plus de 4 ans il y a | 0
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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...
plus de 4 ans il y a | 0
| A accepté
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