Chunru

Last seen: 2 days ago | Active since 2013

Matlab user since 1990

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How do I highlight a certain area between two lines?
% Generate some data t = 0:.1:10; y = sin(t); plot(t, y); hold on % highlight a portion of data idx = t>6 & t<9; area(t...

2 months ago | 0

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How to calculate a running value of a function for every 30 samples?
Nt= 50; % Total samples d = randn(1,Nt); ratioCompute = movmean(d, 30)

2 months ago | 0

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How to count number of ones and zeros in a binary number?
% if you use char to represent binary numbers A='1100'; mod(sum(A=='1'), 2) == 0 % if you use double to represent binaray num...

2 months ago | 0

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Receiving a "Array indices must be positive integers or logical values." message
change the for loops into: x = 1:.1:10; results = abs(q) ./ (4*pi*e0*x.^2); The original program has result(x) where x is not...

2 months ago | 1

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define a counter which will starts counting from zero automatically when the count reaches to 10
c = 0; % initialization while true c = mod( c + 1, 10); % count from 0 to 9 then re-start end

3 months ago | 0

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Reading CSV file with header and other data.
T=readtable("https://www.mathworks.com/matlabcentral/answers/uploaded_files/1174693/Without%20Cooling-%20aluminum%20No1.csv", .....

3 months ago | 0

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Merge the multi-columns, multi-rows in one column, one row
var = ["filename", "xmin", "ymin", "xmax", "ymax"] T = { "Japan_000001_jpg.rf.7b3ecaac169c998a18815a31934dbbea.jpg", 0, ...

3 months ago | 0

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Trying to change the y axis range in fplot
syms s a b c d e f n10 = a + (b*s) + c*(s^2) + d*(s^3) + e*(s^4) + f*(s^5) n10_d1 = diff(n10,s) n10_d2 = diff(n10_d1,s) A = ...

3 months ago | 0

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How to find the maximum value between two indices in an array?
Without yor data and complete code, this is a guess: mode2a = 200; % frequency lower bound (Hz) mode2b = 600; % frequency uppe...

3 months ago | 1

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How to add tolerance to iteration with if statement
x(1,1)=0; %Initial guess, x=0 y(1,1)=0; %Initial guess, y=0 z(1,1)=0; %Initial guess, z=0 R=0.3; %relaxation factor f...

3 months ago | 0

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Answered
Why is my plot blank
P0=300; %power of the heater n=50;% amount of gas (mol) M=28; % Molar mass of Nitrogen gas m=n*M;% m is the mass of the gas(g...

3 months ago | 0

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Bandpass power spectrum density issue
You need fs >2*f_upper. Try fs = 80GHz Wx = 50*10^6; % Signal bandwidth Tx = 1/Wx; % Symbol ti...

3 months ago | 0

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Assign variables from a solve solution
syms k_x Kr_x alpha_x c0=18.1499 alpha0=0.3491 g=9.81 omega=0.54 D2 = [1 2]; for i=1:length(D2) c_x=c0*tanh(k_x*D...

3 months ago | 0

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Answered
How to add tolerance to iteration with if statement
% if a2(i+1,1)-a2(i,1)<0.1 % change the above to: if abs(a2(i+1,1)-a2(i,1))<0.1

3 months ago | 0

Answered
How can I plot this function?
% parameters (use your values) lambdaR = 1; lambdaI = -1; d = 3; p = 2; x = -10:.1:10; w = sqrt(pi/2)*exp((-p^2-4*p*la...

3 months ago | 0

Answered
spline interpolation between three values
P=[100 200 300]; T=[100 150 400]; density=[0.4,0.7,0.8]; Pq =100:300; Tq = spline(P, T, Pq); dq = spline(P, density, Pq)...

3 months ago | 0

Answered
Named arguments in Matlab?
Use arguments block (additionaly for default value, type and size check. doc arguments for more details) self = Renderer(sampl...

4 months ago | 0

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Check for incorrect argument data type or missing argument in call to function 'int'
Break long line codes into shorter ones using ... int is not a builtin function. use fix/floor/round/ceil instead (find out th...

4 months ago | 0

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how to save the values of DelL(T)
Lo = 44.46; Do = 18.76; alpha = 0.0002178 ; T = 36:1:180; DelL = Lo*alpha*(T-35); whos

4 months ago | 0

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Acess all last array elements withtin cells
You can use cellfun: precipitate{1}=[1,2,3,4;1,2,3,4]; precipitate{2}=[1,2,3,4,5;1,2,3,4,5]; precipitate{3}=[1,2,3;1,2,3]; ...

4 months ago | 0

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Answered
I can't figure out why am not getting a plot on my code
If you put the script and local function ga in the same file, then local functions should be placed at the end of the files as s...

4 months ago | 0

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Finding the z transform
syms n omega f(n) f(n) = sin(omega*n) ztrans(f(n))

4 months ago | 0

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Answered
inspection of linearity of data?
load(websave("check_linearity.mat","https://www.mathworks.com/matlabcentral/answers/uploaded_files/1167363/check_linearity.mat")...

4 months ago | 0

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Answered
Why am I getting this error "not enough argument"
The number of input arguments is 6: for r =1:m H_MMSE(: , r ) = MMSEesti(ReceivedPilots (: , r ), TransmittedPilots (: , r...

4 months ago | 0

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Creating 3D array from 2D with increment
A = randi([1, 10], [3, 5]) C = A + reshape(0:2, [1,1,3]) % increment 0, 1, 2 for example

4 months ago | 0

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Answered
Change sequence of consecutive trues to falses, in logical array
x=[true;false;false;true;true;true;true;true]' output = x; dx = diff(x(1:end-1)) output1 = output(2:end-1); output1(output1 ...

4 months ago | 0

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Add indicative labels to vector values
A1 = [ 1 ; 2 ; 3 ]; A2 = [ 4 ; 5 ; 6 ]; A_labeled = [A1 ones(size(A1)); A2 zeros(size(A2))]

4 months ago | 0

Answered
Compact way to plot data with relative colors and legend
% Input a = {'marathon', 1, 4; 'bank holiday', 3, 6; 'bank holiday', 2, 1; 'concert', 0, 4; 'regatta', ...

4 months ago | 1

Answered
Bode Plot options to graph
H = tf([1 0.1 7.5],[1 0.12 9 0 0]); [mag,phase,wout] = bode(H); subplot(211); plot(wout, squeeze(mag(1,1,:))) subplot(212); p...

4 months ago | 0

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How to create a for loop to go through data arrays?
%data = load('file.mat'); data.laser1.pulse=randn(10,1); data.laser2.pulse=randn(10,1); data.laser3.pulse=randn(10,1); dat...

4 months ago | 0

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