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# Chunru

Last seen: 16 days 前 自 2013 起处于活动状态

Matlab user since 1990

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specifying an array size
count=0; b = []; %A =randi([1,9999],10,31); A =randi([1,60],10,31); [row,col]=size(A); for i=1: row for j =1:c...

17 days 前 | 0

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Pcg method is imprecise
The pcg method use tol as a relative tolerance such that norm(residual) < tol*norm(rhs). So you need a different assert. tol =...

17 days 前 | 0

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Sonar Equation Calculator comes with phased array toolbox. You need that toolbox.

1 month 前 | 0

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...

3 months 前 | 0

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)

4 months 前 | 0

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...

4 months 前 | 0

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...

4 months 前 | 1

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

4 months 前 | 0

5 months 前 | 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, ...

5 months 前 | 0

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 = ...

5 months 前 | 0

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...

5 months 前 | 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...

5 months 前 | 0

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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...

5 months 前 | 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...

5 months 前 | 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...

5 months 前 | 0

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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

5 months 前 | 0

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...

5 months 前 | 0

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)...

5 months 前 | 0

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

5 months 前 | 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...

5 months 前 | 0

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

5 months 前 | 0

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]; ...

5 months 前 | 0

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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...

5 months 前 | 0

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

5 months 前 | 0

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inspection of linearity of data?

5 months 前 | 0

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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...

5 months 前 | 0

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

5 months 前 | 0

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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 ...

5 months 前 | 0

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

5 months 前 | 0