Community Profile # Chunru

Last seen: Today Active since 2013

Matlab user since 1990

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why 350*0.001 - 0.350 and 351*0.001 - 0.351 are different from zero
The floating-point numbers are represented by a sequence of binary bits in computer. For matlab, the default double type use 64...

16 hours ago | 0

Divide the new images

1 day ago | 0

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Working on subsection of EMG data
The simplest way (but can be cumbersome) is to plot the data and manually mark the starting and ending point of each section of ...

1 day ago | 0

How to extract the right struct from the cell array of structs based on condition?
load part.mat whos % MATLAB-ish way idx = cellfun(@(x) isfield(x, 'property') && x.property == "Mass %", values); searchedIt...

1 day ago | 0

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How can I solve matrix selection extraction
load C.mat % select columns 1-101, columns 103-203, 205-305, and columns 307-407 % and make them into one matrix. WhatYo...

1 day ago | 0

.csv file row and line
% For earlier version of matlab fid = fopen("test.csv") If possible, use '.' as decimal point rather than ','. % 4,15414 8,...

1 day ago | 0

how to make a patch on geoplot?
You data is not in correct order. The axis scale is also not proportional. Try geoplot if you have mapping toolbox. x = [126...

1 day ago | 0

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Estimating the direction of arrival of a sound signal using time delay sum beamforming
See the comments inside the code array = phased.ULA('NumElements',11,'ElementSpacing',0.04); sensorpos = getElementPosition(ar...

1 day ago | 0

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Calculate a value from a table column based on defined intervals give by another table

1 day ago | 0

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How can the edges on the shortestpath be determined?
s = [1 1 2 3 3 4 4 6 6 7 8 7 5]; t = [2 3 4 4 5 5 6 1 8 1 3 2 8]; G = digraph(s,t); plt = plot(G) [P, d, edgepath] = short...

1 day ago | 2

One hop nearest neighbor in a graph
% Example graph s = [1 1 1 1 1 2 2 2 3 3 3 3 3]; t = [2 4 5 6 7 3 8 9 10 11 12 13 14]; weights = randi([1 10],1,13); G = gra...

2 days ago | 1

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Convert a function into a matrix
Parameters= {'R0','R1','C1','Qr','bo','b1','SOC','Vrc','Voc'}; R0=0.000605797; Qr=147964.8608; R1=0.000856205; C1=0.04982323...

5 days ago | 0

Sorting/Grouping based on date for all years
x = readtable("Example.xlsx"); % head(x) x1 = x(x.Var1>=datetime(2004, 09, 27) & x.Var1<=datetime(2004, 10, 27), :); summar...

5 days ago | 0

How to create a 3D surface plot from scatter3?
test=load('test.txt'); x = test(:,1); y = test(:,2); z = test(:,3); s=scatter3(x,y,z); view(3); figure dt = delaunayTri...

6 days ago | 0

How do I change axis label orientation
[X, Y] = meshgrid(1:.2:10, 1:.2:20); Z = sin(X) + cos(Y); figure surf(X, Y, Z) xlabel('XLabel'); ylabel('YLabel'); zlabel(...

6 days ago | 0

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how to remove values below 0.1?
a = 0.4*rand(100,1); % generate some data a(a<0.1) = nan

6 days ago | 0

predicting crossproduct and magnitude of a vector
Multiple-layer feedforward network is a universal approximater (with some nonlinear transfer functions). So you can predict the...

6 days ago | 1

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table select rows with string/value of two colums
data ={ 704306.281000000 5364346.78000000 440.678000000000 113 'R' 'AX_UnlandVegetationsloseFlaeche' 0 0 0 0 0 0 70...

6 days ago | 0

Hello, I did a for loop but my friend told me it is not the correct matlab syntax. Can anyone help me the for loop is in the description below:
It looks like you want to find the local minima xa = randn(30, 1); Lm = nan(size(xa)); for i=2:length(xa)-1 if xa(i-1)>x...

12 days ago | 0

Storing matrices in cells
for i=1:20 %psudoinverse pH_matrix=pinv(H_matrix); % H_matrix: 1X20 % You can use cell array to store the result ...

12 days ago | 0

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change the hyphen (-) into minus sign (−, “U+2212”)
set(groot,'defaultAxesTickLabelInterpreter','latex'); plot(randi([-60 60], [20, 1])) xticks(-60:20:60) yticklabels(strrep(yt...

13 days ago | 0

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Sign minus, not hyphen
c1 = '−'; % (UTF-16: 2212), not -. c2 = '-'; s1 = "both − and -" s2 = strrep(s1, c1, c2) contains(s1, c1) contains(s2, c1...

14 days ago | 0

A=[1,2,3; 4,5,6; 7,8,9] B=[1,2,3] C= [1,4,6;4,10,18;7,16,27] % Use array (not matrix) multiplication (with auto dimension ex...

14 days ago | 0

Storage many same dimension matrixes to one matrix
Try to avoid eval. Use N-D array or cell array instead. n=10; %100000 x = zeros(4, 4, n); for i = 1:n x(:,:,i) = ifft...

14 days ago | 0

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The definition of layers in general literature is different from that of MATLAB layers. For example, the usual "convolution" la...

14 days ago | 0

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concatenate matrix with zeros function
The code "TxRxPairs = zeros(ants_pairs.Length,2)" is correct. It has the function name "zeros" followed by the arguments inside...

14 days ago | 0

Load multiple files to MATLAB without changing name manually
% list the files to be processed fn = dir("signal*.csv"); for ifile=1:length(fn) current_fn = fn(ifile).name; % [fil...

16 days ago | 0

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How can I find rank of matrix?
% Get the coefficient matrix of the system A = [ 7 6 9 2 7 1 3 2 2 1 5 5 6 4 ...

16 days ago | 1

Need help with Contour plot
x = [1 0.975744 0.294546 0.192422 0.155833 2 0.956922 0.172609 0.112765 0.089115 3 0.950648 0.131963 0....

16 days ago | 0

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