Community Profile

photo

Chunru


Last seen: Today 2013 이후 활성

Matlab user since 1990

Statistics

All
  • Treasure Hunt Participant
  • MATLAB Central Treasure Hunt Finisher
  • 12 Month Streak
  • Guiding Light
  • Number Manipulation I Master
  • Indexing I Master
  • Revival Level 2
  • Knowledgeable Level 5
  • Commenter
  • Sequences And Series II Master
  • Speed Demon
  • Creator

배지보기

Content Feed

보기 기준

답변 있음
How to extract multiple 'y' axis values with respect to 'x' axis from .mat figure
The figure is likely produced using fplot and there is no xdata and ydata available. f=openfig('imp.fig'); f.Children.Children...

약 16시간 전 | 0

답변 있음
Plotting a time domain Signal
N=256; f=(0:N-1)/N; xf = 2*sinc(2*f); % 2*sin(w)/w => 2*sinc(2*f) x_i=ifft(xf); plot(f, real(x_i), 'r', f, imag(x_i), '...

약 17시간 전 | 0

답변 있음
RMSE heart rate estimation
hrerror = randn(100, 1); % generate some random data hr_rmse =rms(hrerror) % use rms function hr_rmse1 = sqrt(mean(hr...

약 17시간 전 | 0

| 수락됨

답변 있음
Shade between lines in log-y scale not properly plot
load data_ecdf figure(1) % just to view the expected filled area semilogy(eOut.psSST, eOut.sSST);grid on;ylabel('mg/L');hold o...

약 17시간 전 | 0

| 수락됨

답변 있음
my DCT2 algorithm results in blank image, please help
A = rgb2gray(imread('Lenna.png')); figure; imshow(A); whos B = zeros(64,64); for i = 1:64 for j = 1:64 %Split ...

1일 전 | 0

답변 있음
Import numeric data from mixed txt file
a = readtable('data.txt', 'CommentStyle', '#')

1일 전 | 0

답변 있음
ifft2 with "symmetric option"
Let F(u, v) be the forward FFT2 of f(x, y). For real function f(x,y), FT exhibits conjugate symmetry, i.e. F(u, v) = F*(-u, -v...

1일 전 | 0

답변 있음
Auto adjust y axis with imhist
img = imread('cameraman.tif'); subplot(2,3,1) image(img) colormap('gray') subplot(2,3,2) imhist(img); ylim auto

1일 전 | 0

답변 있음
Error using freqz, 6 columns needed to be a valid SOS matrix
freqz is for filter response. use fft or pwelch (or other spectrum estimator) for ploting spectrum of signal. %Generate Sound ...

1일 전 | 0

답변 있음
Error in matrix assignment
The image from the file "img" has a size of 256-by-256. However, you have defined the img_stack with size of 128-by-128-by-#of_...

5일 전 | 1

| 수락됨

답변 있음
Hypothetical Factorial Question Solution
x = 120; nfact = 1; for i = 1:x nfact = nfact*i; if nfact==x fprintf("%d = %d!\n", x, i) break ...

6일 전 | 0

답변 있음
Invert even and odd columns in an image
a = randn(10, 10, 3); imshow(a) % swap even and odd columns b = zeros(size(a)); b(:, 1:2:end, :) = a(:, 2:2:end, :); b(:, 2...

6일 전 | 1

답변 있음
why I receive this error "Array indices must be positive integers or logical values"?
gamma = 0.5; beta = 0.9; w = 0.3; r = 1.2; [c1star] = c1a(w,r,gamma,beta) function c1a = c1a(w,r,gamma,beta) % ...

7일 전 | 0

| 수락됨

답변 있음
Can I remove zeroth order baseline?
raw = readtable('raw.xlsx'); Xcontractions = raw.rXcont; Ycontractions = raw.rYcont; Time = raw.Time; %% Low-pass filter ...

7일 전 | 0

| 수락됨

답변 있음
Multiple bar plot of different datasets in the same figure
x = rand(6,2); b = bar(x); % control the color of individual bar % 1st group first bar b(1).FaceColor = 'flat'; b(1).CDat...

7일 전 | 1

| 수락됨

답변 있음
FFT Amplitude and FFT Normalization
There are different ways of interpreting the FT. Here is one way according to Parseval's theorem: or The LHS of the firs...

7일 전 | 2

답변 있음
I need ziggurat matlab code to draw
where is a normalizing constant that we can ignore. x = [0:.1:2] y = 1/(2*pi)*exp(-x.^2/2); stairs(x, y, 'b'); hold o...

8일 전 | 0

| 수락됨

답변 있음
Find the variation of x(t)
syms x(t) Dx = diff(x, t); eqn = diff(Dx, t) + 7* Dx + 5*x == 8 cond = [x(0)==1, Dx(0)==2]; y = dsolve(eqn, cond) fplot(y, ...

8일 전 | 0

| 수락됨

답변 있음
matlab solver with respect to x^2
syms x a y equ1=x^2+x^4==a equ2 = subs(equ1, x^2, y) S=solve(equ1,x) Sx2 =solve(equ2) subs(Sx2, a, 1)

12일 전 | 0

답변 있음
How to count the number of white pixels
First, you should use gray scale image. Second you have a large white margin in your data (which is not seen from imshow). You...

12일 전 | 1

| 수락됨

답변 있음
How to plug in algebraic equation and solution for it?
It seems that the equation you give has no soltion. f = @(t) 3.7 *( 1 + 4.1*.006/170*(3.7/180)^(2/3) * nthroot(t.^5, 3)).^-1.5;...

12일 전 | 0

답변 있음
removing some data in a 4d plot
data = load('4dplot.txt'); % x = 4dplot(:,1); % wrong: variable names canno start with number x = data(:,1);...

13일 전 | 1

답변 있음
How to convert a text file into a table properly
Try this: fid = fopen('test.txt', 'r'); fgetl(fid); % skip the header i=1; x = []; while ~feof(fid) s = fgetl(fid); ...

13일 전 | 0

답변 있음
What optimizer should I use?
Consider your objective function f(T, R1, R2), whose dependence on R2 lies on the first term only. To minimise f, R2 need to ...

13일 전 | 0

답변 있음
How to convert a text file into a table properly
T = readtable('test.txt', 'Delimiter', '-->') for i=1:size(T,1) for j=2:size(T,2) T{i, j}{1} = str2num(T{i, j}{1}...

13일 전 | 0

답변 있음
ga optimization changing answer
GA need random initialization of population and it also involves random processing in generating children. Therefore, the resul...

14일 전 | 0

| 수락됨

답변 있음
How to make a Comparison of the values of a matrix for different iteration ?
A=randi([2 5],[3,4]) j=10 for i=1:j B=A.*randi([2 5] ,[3,4]); % Do your comparison here between B and A %...

14일 전 | 0

답변 있음
Calculate peak of pulses above certain threshold
load example.mat %whos plot(C(19e5:20e5)); % compute envelope before findpeaks env = envelope(C, 1000, 'peak'); hold on ...

14일 전 | 0

답변 있음
Dividing matrices of different dimensions
B = reshape(1:64, 8, 8); % generate B matrix A = repmat(B, [32 32]); % repeating 32x32 imagesc(A)

14일 전 | 0

| 수락됨

답변 있음
How do you plot the average of a group of lines in a figure?
h = openfig("Damping_mode_2.fig", "visible"); hl = findobj(h, 'Type', 'Legend'); hl.Location = 'southoutside'; hl.NumColumns =...

14일 전 | 0

| 수락됨

더로드