Chunru

Last seen: 1 jour ago | Active since 2013

Matlab user since 1990

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

1 jour ago | 0

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

2 jours ago | 0

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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...

2 jours ago | 0

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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...

2 jours ago | 0

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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)

3 jours ago | 0

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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...

3 jours ago | 0

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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'...

4 jours 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), '...

4 jours 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...

4 jours 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...

4 jours 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 ...

5 jours ago | 0

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

5 jours ago | 0

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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...

5 jours 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

5 jours 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 ...

5 jours ago | 0

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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_...

8 jours 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 ...

9 jours 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...

9 jours 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) % ...

10 jours 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 ...

10 jours 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...

10 jours 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...

10 jours ago | 2

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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...

11 jours 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, ...

11 jours 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)

15 jours 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...

15 jours 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;...

15 jours ago | 0

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

16 jours ago | 1

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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); ...

16 jours 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 ...

16 jours ago | 0

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