Chunru

Last seen: Today | Active since 2013

Matlab user since 1990

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How to fix error "Array indices must be positive integers or logical values."
function xc = mybisect(f, a, b, tol) format longg; a_vals = zeros(a, length(tol)); b_vals = zeros(b, length(tol)); c_vals = ...

environ 19 heures ago | 1

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Answered
strings in conditional statments
l = input('Do you want to plot: ', "s"); % s for string if l == "yes" % string comparison instead of cha...

environ 21 heures ago | 0

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Is my matlab code for the sinc signal below correct.
%************ Variable declaration****************** t = -20:0.1:20; p = -10:1:10; signal = zeros(1,length(t)); %for spped al...

environ 22 heures ago | 0

Answered
How to plot the convolution integral of two functions
Use symbolic math: syms x y h tau %x = 0:0.5:10; y = exp(-x); % use -1 and -2 to ensure convolution exist h = exp(-2...

2 jours ago | 1

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Error: Edge vector must be monotonically non-decreasin with isosurface
Nx = 32; Ny = 32; Nz = 32; Lx = 2*pi; Ly = 2*pi; Lz = 2*pi; x = (0:Nx-1)/Nx*2*pi; % x coordinate in Four...

2 jours ago | 0

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How to plot envelope of a signal
load t.mat load signal.mat whos plot(t, signal); hold on [yupper,ylower] = envelope(signal,1000, 'peak'); plot(t, yupper, ...

2 jours ago | 0

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Answered
Cross Correlation lag issue
P2 = randn(10, 1); P3 = [zeros(5, 1); P2]; % P3 is P2 delayed by 5 [xc2,lags2] = xcorr(P2,P3); plot(lags2, xc2) [rho2,imax...

3 jours ago | 0

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Adding XYZ axis in RGB colors in the corner of a plot
plot(rand(10,1)) annotation('arrow', [0.8, 0.7], [0.8, 0.75], 'Color', 'r') annotation('textbox', [0.68, 0.70 0.05 0.05], 'Str...

3 jours ago | 0

Answered
How to label a structure name in a loop
low.t1 = 2; low.t2 = 3; for i=1:2 data = low.("t"+i) end

3 jours ago | 0

Answered
Reorder vector without for loop
A = randn(583200, 10); B =reshape(A, 540, [], 10); B = permute(B, [2 1 3]); B = reshape(B, 583200, 10); whos % To verif...

3 jours ago | 0

Answered
using subplot in bar , how to adjust bar width
x1 = [1 2 3]; y1 = [1 2 3 ]; x2 = [1 2 3 4 5]; y2 = [1 2 3 4 5]; % Make xlim same so that the bar width is the same h1= s...

4 jours ago | 0

Answered
Rotate Basis Vectors Programmatically
V1 = orth(randn(6)) % your original orthonormal basis % Then you can apply any other orthonormal basis to it % For e...

6 jours ago | 1

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Sorting Values my Integer and Decimal Values
p = [8.1 8.2]; if floor(p(1)) == floor(p(2)) disp("A pair.") end f = [2.1 , 3.1 , 4.1, 5.1, 6.1]; if all(abs(diff(mo...

6 jours ago | 1

Answered
Correlate Signals with different time points
You can resample the data into sime sampling time: doc resample doc retime doc interp1 After both signals are sampled in the...

6 jours ago | 0

Answered
How to remove the AWGN noise from data?
Uo=[20 30 40 50]; % signal U=awgn(Uo,30) % add noise to signal % Uo=U-awgn(30); % if you don't know t...

6 jours ago | 0

Answered
How to trasform from cell to matrix and transpose from horizontal to vertical at the same time?
Data.my_cell{1} = randn(1, 11); Data.my_cell{2} = randn(1, 11); Data.my_cell{3} = randn(1, 11); Data.my_cell my_matrix = cel...

8 jours ago | 1

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Answered
How do I zoom in on a certain section of a magnitude bode plot
num = [1]; den = [1 0.04946 3.00316 0.0989847 3.00322 0.0494631 1.00006]; g=tf(num, den) bode(g) grid on ax = findobj(gcf, ...

8 jours ago | 0

Answered
Obtaining Sine Wave From Square Wave
% generate a square wave with no fixed period f = 0.125; fs=1; s = 0.3+sin(2*pi*f*(0:40)); % a sine wave with offset x =2* (...

8 jours ago | 0

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Answered
why do I get this error while using qammod? "Expected input number 1, X, to be an array with all of the values < 4."
A few bugs in program. The major one is generating input signa which should bel: tx_bits=randi([0 M-1], [N_data_symbol,1]); N...

8 jours ago | 1

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Answered
Using trapz function to provide answers using loop
% The way to use trapz x= 1:20; % x y = randn(20, 1); % y ytrapz = trapz(x, y) % integr...

8 jours ago | 0

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Answered
Storing sparse matrices in cell or struct without converting them to full
The sparse array in cell is still sparse array as shown below, Can you show the problem you have encountered? a = sparse(eye(1...

8 jours ago | 0

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Answered
How to import exponent number from Excel column to MATLAB
x = readtable("2powx.xlsx") y = cellfun(@(a) sscanf(a, "%d^%d")', x.LSB, "UniformOutput", false) y = cell2mat(y) y = y(:, 1)....

9 jours ago | 0

Answered
How to fit a gaussian distribution curve on a bar diagram?
p = [1/36,2/36,3/36,4/36,5/36,6/36,5/36,4/36,3/36,2/36,1/36]; xsum =[2,3,4,5,6,7,8,9,10,11,12] ; bar(xsum, p) mu = sum(p.*xsu...

9 jours ago | 0

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Answered
Why do I get error when using a simple global variable?
Not sure what the code is trying to do. However, the error is due to the wrong usage of ( ) rather than global variables. glob...

9 jours ago | 1

Answered
How can I plot direction of principal components in PCA
x = randn(4, 2); plot(x(:,1), x(:,2), 'ro', 'DisplayName', 'data'); axis equal; hold on p = pca(x); xc = mean(x); quiver(x...

9 jours ago | 0

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Answered
Smoothing data with sgolay filter
framelen = 11; order = 3; % adjust these values smootheddata = sgolayfilt(z, order, framelen);

9 jours ago | 0

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Unrecognized function or variable 'sum'.
classdef question2 methods function q2a = l1qa(~,table) % clear sum; s...

9 jours ago | 0

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Answered
I have a 2x2 matrix with values [0.5694 -0.8220; -0.8220 -0.5694] How do I plot this matrix?
x = [0.5694 -0.8220; -0.8220 -0.5694] heatmap(x); figure plot(x(:, 1), x(:,2)) % take 1st column as x and 2nd column as y (...

9 jours ago | 0

Answered
Get the displacement component which is perpendicular to the triangle (finite element)
% In order to know the normal of triangle, you need the coordinated of % triangle postri = randn(3, 3) % x y z v = dif...

9 jours ago | 1

Answered
Separating a timestamp into individual components
times = [ 20082009 21082009 22082009 23082009]; d = floor(times/1e6); m = mod(floor(times/...

9 jours ago | 0

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