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Chunru


Last seen: 2 giorni ago Active since 2013

Matlab user since 1990

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Answered
Getting "Unrecognized function or variable 'reshape'" error!!
%reshape([1 2 3 4],:,1); reshape([1 2 3 4], [], 1) % use [] for auto computed size

2 giorni ago | 0

Answered
create 256* 256 matrix with loop values 0 to 7
x = repmat(0:7, 256, 32)

3 giorni ago | 0

| accepted

Answered
In the follow screenshot why do we use this filter to our signal I ?
You have a discrete linear system. You could find the system transfer function by analysing the system. It turns out to be a f...

3 giorni ago | 0

Answered
Extracting data from confusion matrix fig
f = openfig('SqueezeNet-CM', 'visible'); h = findobj(f.Children(2).Children, 'Type', 'Text'); data = zeros(length(h), 1); for...

3 giorni ago | 0

Answered
How to write Exponential growth
x1 = logspace(0, 5, 11) % 11 points btw 10^0 and 10^5 in log space x2 = 10.^(0:.5:5)

4 giorni ago | 0

Answered
I am trying to figure out how to plot my data.
Data101 = linspace(0,10,500); red_line = sin(2*pi*Data101)*1.5; for i = 1:length(Data101) if red_line(i) >= 0.95 && red_l...

4 giorni ago | 0

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Answered
How to extract multiple 'y' axis values with respect to 'x' axis from .fig file
The figure is likely produced using fplot. The appropriate object handle is of type "ImplicitFunctionLine". f=openfig('imp.fig'...

5 giorni ago | 0

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Answered
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), '...

5 giorni ago | 0

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

5 giorni ago | 0

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Answered
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...

5 giorni ago | 0

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Answered
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 ...

6 giorni ago | 0

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

6 giorni ago | 0

Answered
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...

6 giorni ago | 0

Answered
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

6 giorni ago | 0

Answered
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 ...

6 giorni ago | 0

Answered
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_...

9 giorni ago | 1

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Answered
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 ...

10 giorni ago | 0

Answered
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...

10 giorni ago | 1

Answered
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) % ...

11 giorni ago | 0

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

11 giorni ago | 0

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Answered
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...

11 giorni ago | 1

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Answered
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...

11 giorni ago | 2

Answered
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...

12 giorni ago | 0

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Answered
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, ...

12 giorni ago | 0

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Answered
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)

16 giorni ago | 0

Answered
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...

16 giorni ago | 1

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Answered
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;...

16 giorni ago | 0

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

17 giorni ago | 1

Answered
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); ...

17 giorni ago | 0

Answered
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 ...

17 giorni ago | 0

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