Community Profile # Chunru

Last seen: Today Active since 2013

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...

4 hours ago | 1

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How do I zoom in on a certain section of a magnitude bode plot
num = ; 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, ...

5 hours ago | 0

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* (...

6 hours ago | 0

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...

6 hours ago | 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...

9 hours ago | 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...

9 hours ago | 0

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 day ago | 0

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 day ago | 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 day ago | 1

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 day ago | 0

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

1 day ago | 0

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

1 day ago | 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 day ago | 0

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 day ago | 0

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

1 day ago | 0

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

1 day ago | 0

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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 day ago | 0

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Scatter plot with mean for multiple groups

1 day ago | 0

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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...

1 day ago | 0

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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 ...

1 day ago | 0

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...

2 days ago | 0

How to get the intensity value of the flower

2 days ago | 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 ...

2 days ago | 0

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...

2 days ago | 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 days ago | 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 days ago | 0

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 days ago | 0

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 days ago | 0

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