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Getting wrong sine wave for frequency 10KHz
Think about your sampling rate: f = 10000; t = 0:1/(25*f):0.002; plot(t,sin(2*pi*f.*t))

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split matrix into two based on column values
A = [ 1 2 1.4; 1 3 1.4; 2 5 1.4; 1 5 81; 3 4 1.4; 5 4 81] A1 = A(A(:,end)>80,:) A2 = A(A(:,end)<=80,:)

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How to change the direction of x axis.
A = imread('ngc6543a.jpg'); imshow(A) B = fliplr(A); imshow(B)

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Why can't a circle be detected in such an obvious image?
Use a range for radius input argument such as: [centers1,radii1] = imfindcircles(img,[50 200],'Sensitivity',0.85,'ObjectPolarit...

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Help with solving a system of equations
Please check carefully if this is correct and if it is what you need: %% Case 1: N = 19 % clc % clear % b = 6; % Vinf = 1...

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How to calculate NDI Index
NDI_new = uint8(rescale(NDI, 0, 255));

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Re-Install your Matlab version if you are not able to undelete the file. There is no other legal way to help you, because it is ...

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How to set Assumptions for function handle?
See fimplicit3 example here and use interval argument: f = @(x,y,z)x.^2+y.^2+z.^2-1; fimplicit3(f, [-1, 1, -1, 1, 0, 1])

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Loop function takes too long. How can I reduce the processing time?
Yes, diff in as inbuilt and vectrorized function to get what you want. Run this command on a vector input will give you all the ...

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Splitting code into groups
Note that the run button will run all your code in one, while the other buttons will run you code section wise and go / go not t...

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Solution to a simple equation
use isolate instead of solve: clear all; close all; syms R L C omega eqn=1 - 2*C*L*omega^2 + C^2*R^2*omega^2 + C^2*L^2*omega^...

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how to make a function of this system
syms a b y1(t) y2(t) ode(1,1) = diff(y1,t,2) == a*y2 - cos(diff(y1,t)); ode(2,1) = diff(y2,t) == b*y1 + cos(t) [V,S] = od...

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error with plotting graph
Since theta is a vector you need to perform elementwise multiplication: a = 13; c = 17; k = 2*pi/3; theta = 0:0.0001:2*pi; ...

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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; ...

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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 =...

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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...

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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 ...

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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...

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All possible combination based on 2^n
n = 3 ff2n(n)

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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 ...

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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)

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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...

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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...

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how to remove spaces in a string?
A = ["Ly R4", "Ba R7", "Ty Ru"] B = erase(A," ")

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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);...

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Converting Cell matrix to a Numeric Matrix
B={'2' '3' '5'; '4' '7' '2'; '7' '5' '2'} C = cellfun(@(x)str2double(x),B)

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extracting droplets with fringes from a image
Have a look at imfindcircles. It might be useful to run imbinarize first.

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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...

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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...

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Function that returns the number given squared
https://de.mathworks.com/help/matlab/ref/function.html?s_tid=doc_ta#btexm3w

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