Answered

Getting error with the code in ode45 function

t=[0 5]; inity = 1; [t,y]=ode45(@f, t, inity); plot(t,y) function dy = f(~,y) % y=[9,100]; dont overwrite y D=0.00000001; ...

Getting error with the code in ode45 function

t=[0 5]; inity = 1; [t,y]=ode45(@f, t, inity); plot(t,y) function dy = f(~,y) % y=[9,100]; dont overwrite y D=0.00000001; ...

3 years ago | 0

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Answered

How can I plot the Temperature distribution in this code.

Play arround with slice: % LBM 3D - D3Q15 Heat Diffusion in a Plate % Problem - 5.10 clc clear variables close all alpha =...

How can I plot the Temperature distribution in this code.

Play arround with slice: % LBM 3D - D3Q15 Heat Diffusion in a Plate % Problem - 5.10 clc clear variables close all alpha =...

3 years ago | 1

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Answered

How to multiply a matrix to another cell matrix

Use cellfun: A = magic(3) C = {rand(3,4); rand(3,4); rand(3,4); rand(3,4); rand(3,4)} result = cellfun(@(x)mtimes(A,x),C,'Uni...

How to multiply a matrix to another cell matrix

Use cellfun: A = magic(3) C = {rand(3,4); rand(3,4); rand(3,4); rand(3,4); rand(3,4)} result = cellfun(@(x)mtimes(A,x),C,'Uni...

3 years ago | 1

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Answered

Why do the ode45 solver is not running in my code?

Your problem appears to be stiff - use ode15s instead: clear; clc; a = 1; %alpha p = 7.5; %rho b = 4; %beta g = 16; %gamma ...

Why do the ode45 solver is not running in my code?

Your problem appears to be stiff - use ode15s instead: clear; clc; a = 1; %alpha p = 7.5; %rho b = 4; %beta g = 16; %gamma ...

3 years ago | 0

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Answered

i'm getting this error "Unable to perform assignment because the left and right sides have a different number of elements"

Problem 1 h returns more than one solution which produces the error because the result of xa1(i+1)=I2(i)+h*S2(1) with h bein...

i'm getting this error "Unable to perform assignment because the left and right sides have a different number of elements"

Problem 1 h returns more than one solution which produces the error because the result of xa1(i+1)=I2(i)+h*S2(1) with h bein...

3 years ago | 1

Answered

percent of similarity between images

When using a neural net you could use the score output argument to get this. Look at this example there is a bar chart based on ...

percent of similarity between images

When using a neural net you could use the score output argument to get this. Look at this example there is a bar chart based on ...

3 years ago | 0

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Answered

How I can append matrices of different dimensions in another matrix?

A = randi(10, 3, 1) B = rand(4, 1) C = randi(10,5,1) D = vertcat(A,B,C)

How I can append matrices of different dimensions in another matrix?

A = randi(10, 3, 1) B = rand(4, 1) C = randi(10,5,1) D = vertcat(A,B,C)

3 years ago | 0

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Answered

Checking if 2 edges in a graph are connected

You could use the neighbors function, which gives a list of connected nodes for a given node. You could combine this with the is...

Checking if 2 edges in a graph are connected

You could use the neighbors function, which gives a list of connected nodes for a given node. You could combine this with the is...

3 years ago | 0

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Answered

hi guys, I want to make a spectral RollofPoint of speech and when I enter this code from mathworks, I get this error that the variable t1 is not declared, even though I declared it. Please I will be happy for every piece of advice.

You have to run code so that the variables appear in your workspace. go to the editor tab and press "run". the editor tab appear...

hi guys, I want to make a spectral RollofPoint of speech and when I enter this code from mathworks, I get this error that the variable t1 is not declared, even though I declared it. Please I will be happy for every piece of advice.

You have to run code so that the variables appear in your workspace. go to the editor tab and press "run". the editor tab appear...

3 years ago | 0

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Answered

how to remove spaces in a string?

A = ["Ly R4", "Ba R7", "Ty Ru"] B = erase(A," ")

how to remove spaces in a string?

A = ["Ly R4", "Ba R7", "Ty Ru"] B = erase(A," ")

3 years ago | 1

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Answered

Using previous value to get the next in for loop

The semicolon operator supresses outputs to the command window: h=0.1; y(1) = 0; for k=2:6003 y(k) = y(k-1) + h.*u(k-1);...

Using previous value to get the next in for loop

The semicolon operator supresses outputs to the command window: h=0.1; y(1) = 0; for k=2:6003 y(k) = y(k-1) + h.*u(k-1);...

3 years ago | 1

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Answered

Converting Cell matrix to a Numeric Matrix

B={'2' '3' '5'; '4' '7' '2'; '7' '5' '2'} C = cellfun(@(x)str2double(x),B)

Converting Cell matrix to a Numeric Matrix

B={'2' '3' '5'; '4' '7' '2'; '7' '5' '2'} C = cellfun(@(x)str2double(x),B)

3 years ago | 1

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Answered

extracting droplets with fringes from a image

Have a look at imfindcircles. It might be useful to run imbinarize first.

extracting droplets with fringes from a image

Have a look at imfindcircles. It might be useful to run imbinarize first.

3 years ago | 0

Answered

Multiplication of two different continuous signal in Matlab

You made a mistake in defining t2...t6: x = 0:0.05:6; y = sin(x); subplot(3,1,1) plot(x,y) t1 = 0:0.05:1; t2 = 1.05:0.05:2...

Multiplication of two different continuous signal in Matlab

You made a mistake in defining t2...t6: x = 0:0.05:6; y = sin(x); subplot(3,1,1) plot(x,y) t1 = 0:0.05:1; t2 = 1.05:0.05:2...

3 years ago | 0

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Answered

Datetime coloumn in a matrix of double

You can not mix data types in arrays - use a table or a timetable to do this. In your case the array2table or array2timetable mi...

Datetime coloumn in a matrix of double

You can not mix data types in arrays - use a table or a timetable to do this. In your case the array2table or array2timetable mi...

3 years ago | 0

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Answered

Function that returns the number given squared

https://de.mathworks.com/help/matlab/ref/function.html?s_tid=doc_ta#btexm3w

Function that returns the number given squared

https://de.mathworks.com/help/matlab/ref/function.html?s_tid=doc_ta#btexm3w

3 years ago | 0

Answered

Matlab plot problem line 13

syms r E y K eqn = r*(1-y/K)*y-E*y==0; S = solve(eqn); y1=S(1); y2=S(2); h=0.01; E=1; r=2; K=1; y = double(y1-h:h:subs(...

Matlab plot problem line 13

syms r E y K eqn = r*(1-y/K)*y-E*y==0; S = solve(eqn); y1=S(1); y2=S(2); h=0.01; E=1; r=2; K=1; y = double(y1-h:h:subs(...

3 years ago | 1

Answered

How to produce square matrix in this form

k = 2; % define how often to repeat the pattern result = toeplitz([5 repmat([1 0 0 0],1,k)]) gives: result = 5 1 ...

How to produce square matrix in this form

k = 2; % define how often to repeat the pattern result = toeplitz([5 repmat([1 0 0 0],1,k)]) gives: result = 5 1 ...

3 years ago | 1

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Answered

how do i plot a complicated function

alpha = 2; gamma = 3; k1 = 0.5; k2 = 0.15; syms eta(x,y) Eta eta(x,y) = (sqrt((x*k1+gamma*(1-y)-alpha)^2-4*x.*(gamma*k2...

how do i plot a complicated function

alpha = 2; gamma = 3; k1 = 0.5; k2 = 0.15; syms eta(x,y) Eta eta(x,y) = (sqrt((x*k1+gamma*(1-y)-alpha)^2-4*x.*(gamma*k2...

3 years ago | 1

Answered

Solve equation (unrecognized function or variable)

% define t as symbolic syms t N = 5.62; R = 6.40; W = 600; eqn = (10 + 2.*W.^(2).*t.^(2) - 8.*W.^(4).*t.^(4))./(10 +23.*...

Solve equation (unrecognized function or variable)

% define t as symbolic syms t N = 5.62; R = 6.40; W = 600; eqn = (10 + 2.*W.^(2).*t.^(2) - 8.*W.^(4).*t.^(4))./(10 +23.*...

3 years ago | 0

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Answered

How to doI plot F(x) = [1 -(10/x)]/[1-(100/x^2)] for X ranging from 100 to 1100 at an interval of 50?

F = @(x) (1-(10./x))./(1-(100./x.^2)); x_vals = 100:50:1100; plot (x_vals, F(x_vals))

How to doI plot F(x) = [1 -(10/x)]/[1-(100/x^2)] for X ranging from 100 to 1100 at an interval of 50?

F = @(x) (1-(10./x))./(1-(100./x.^2)); x_vals = 100:50:1100; plot (x_vals, F(x_vals))

3 years ago | 2

Answered

Change frame rate of video file

You are fully right. First read all the frames using the read command for VideoReader. Then make a VideoWriter object and use th...

Change frame rate of video file

You are fully right. First read all the frames using the read command for VideoReader. Then make a VideoWriter object and use th...

3 years ago | 1

Answered

How to optimise two variables at once

b = 166; %inertance c = 2000; %damping value lb = [0 500]; % lower bound ub = [500 3000]; % upper bound x0 = [b, c]; %...

How to optimise two variables at once

b = 166; %inertance c = 2000; %damping value lb = [0 500]; % lower bound ub = [500 3000]; % upper bound x0 = [b, c]; %...

3 years ago | 0

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Answered

How to find every combination of values in a cell array?

One way, using allcomb: M = {[1,2,3], [4,5,6],[7,8,9]; [10,11],[12,13],[14,15]; [16,17,18,19,20],[21,22,23,24],[25,26,27,28]}...

How to find every combination of values in a cell array?

One way, using allcomb: M = {[1,2,3], [4,5,6],[7,8,9]; [10,11],[12,13],[14,15]; [16,17,18,19,20],[21,22,23,24],[25,26,27,28]}...

3 years ago | 1

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Answered

function in matlap#

https://de.mathworks.com/help/matlab/ref/function.html https://de.mathworks.com/help/matlab/matlab_prog/create-functions-in-fil...

function in matlap#

https://de.mathworks.com/help/matlab/ref/function.html https://de.mathworks.com/help/matlab/matlab_prog/create-functions-in-fil...

3 years ago | 0

Answered

How to ignore negative indices or assign it to zero in a loop

It is not needed to make the elements zero - they are already, because you preallocated y with zeros: x=[1 2 -1 -3 -4] h=[0 1 ...

How to ignore negative indices or assign it to zero in a loop

It is not needed to make the elements zero - they are already, because you preallocated y with zeros: x=[1 2 -1 -3 -4] h=[0 1 ...

3 years ago | 0

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Answered

Matlab schließt sich sofort nach dem starten wieder

Hallo, in diesem Forum wird fast ausschließlich auf Englisch geschrieben - was die Chance Deiner Frage beantwortet zu werden dr...

Matlab schließt sich sofort nach dem starten wieder

Hallo, in diesem Forum wird fast ausschließlich auf Englisch geschrieben - was die Chance Deiner Frage beantwortet zu werden dr...

3 years ago | 0

Answered

Helo everyone, I want to ask about my error in matlab. Error: File: Untitled5.m Line: 57 Column: 56 -> (rand(1,nvar).*c1.*(pbest(pop,:)x(pop,:))+...) Invalid expression. Check for missing multiplication operator, missing or unbalanced delimiters, or

Line 36: for iter=1:maxiter for pop=1:maxpop % update velocity v(pop,:)=w*v(pop,:)+... rand(1,nvar)...

Helo everyone, I want to ask about my error in matlab. Error: File: Untitled5.m Line: 57 Column: 56 -> (rand(1,nvar).*c1.*(pbest(pop,:)x(pop,:))+...) Invalid expression. Check for missing multiplication operator, missing or unbalanced delimiters, or

Line 36: for iter=1:maxiter for pop=1:maxpop % update velocity v(pop,:)=w*v(pop,:)+... rand(1,nvar)...

3 years ago | 0

Answered

Create Block Toeplitz Matrix

Try: rng(123) A = eye(3); B = randi(10,3); Omega = kron(A,B) gives: Omega = 7 6 10 0 0 0 0 ...

Create Block Toeplitz Matrix

Try: rng(123) A = eye(3); B = randi(10,3); Omega = kron(A,B) gives: Omega = 7 6 10 0 0 0 0 ...

3 years ago | 0