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Chunru


Last seen: Today 2013 以来アクティブ

Matlab user since 1990

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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...

約9時間 前 | 1

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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, ...

約10時間 前 | 0

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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* (...

約11時間 前 | 0

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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...

約11時間 前 | 1

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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...

約14時間 前 | 0

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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...

約14時間 前 | 0

回答済み
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)....

1日 前 | 0

回答済み
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...

1日 前 | 0

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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...

1日 前 | 1

回答済み
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...

1日 前 | 0

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

1日 前 | 0

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

1日 前 | 0

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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 (...

1日 前 | 0

回答済み
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...

1日 前 | 0

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

1日 前 | 0

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Suppress Window using System Command
cd("C:\Program Files\Bentley\Offshore\MAXSURF CONNECT Edition V23") cmd = "MaxsurfModeler64.exe display off" system(cmd)

1日 前 | 0

| 採用済み

回答済み
plot graphs with a range
R = 2.303 * 8.314; T = 273 + 20; F = 96500; Eqv = @(z, Xout, Xin) ((R * T) / (z * F)) * log(Xout/Xin); fprintf("<Question 1:...

1日 前 | 0

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回答済み
Scatter plot with mean for multiple groups
x = readtable("https://www.mathworks.com/matlabcentral/answers/uploaded_files/1136975/MATLAB_exampledata.xlsx"); x.Group = cate...

2日 前 | 0

回答済み
Find the first value that is greater than or equal to and its corresponding value
data =[ 0.01 3 0.02 4 0.03 6 0.04 9 0.05 12 0.06 14 0.07 15 0.08 18]; idx = find(dat...

2日 前 | 0

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回答済み
How can I insert many columns into a matrix at different locations efficiently?
%Create some "data" A = rand(100); %some random data col = randsample(100,15); A(:, col)=zeros(100,15); %some random columns ...

2日 前 | 0

回答済み
I am not sure why my function is undefined for input arguments double.
x = rand([-20 20]); % generate random number in range [-20 20] % call the function % output function_name input_argume...

3日 前 | 0

回答済み
How to get the intensity value of the flower
im = imread("https://www.mathworks.com/matlabcentral/answers/uploaded_files/1136290/image.jpeg"); whos im = rgb2gray(im); ...

3日 前 | 0

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How to convert a sym variable to an ordinary variable?
t= linspace(-1,3); syms x_t(t); x_2(t) = piecewise(t<-1,(2),-1<t<=-.5,(t.*4+6),-.5<t<2, (-2.4*t+3),t==2,(2),t>=2, (2)); y ...

3日 前 | 0

回答済み
how can I plot a trajectory of moving point ?
npts=1; v=28.8/3.6; radius=1000; center=[0 0]; MOVE(npts, v, radius, center) function MOVE(npts, v, radius, center) d...

3日 前 | 0

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can anyone help me ? i keep getting this error
num_roots=5; num_functions=6; %initial guess for roots (from Wolfram MathWorld) zeros_guess=[2.4,3.8,5.1,6,7.5,8.7;... 5.5...

3日 前 | 0

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Use a grid/image get positional inputs and measure time in-between clicks.
You can make your function based on ginput or getpts. Edit one of these matlab functions and add the output argument of t and r...

3日 前 | 0

回答済み
Having trouble calling a user defined function.
TableOne = array2table([1988*ones(10,1) randn(10, 2)]) TableTwo = array2table([1988*ones(10,1) randn(10, 2)]) %This complete...

3日 前 | 0

回答済み
Volume formed by a moving triangle
% initial triangle p1 = [0, 0, 0]; p2 = [3, 0, 0]; p3 = [0 4 0]; % the velocity vector should be specified (instead of final t...

6日 前 | 0

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How could I sums up 1/n for n=1 to 10000?
It can be run as shown below. What problem have you encountered? n = 10000; % whatever you want sum_harm = 0; for i = 1:n ...

6日 前 | 0

回答済み
i need series representation for the equation of erfc(x) and maching with it in plot
x = 0.5; format long erfc(x) for n=1:20 y(n) = erfc_by_series(x, n); end y' function y= erfc_by_series(x, n) ...

6日 前 | 0

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