Chunru

Last seen: 3 dagen ago | Active since 2013

Matlab user since 1990

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How do I use a user input string to reference a structure that already exists?
Here is one solution without dynamically naming a variable: ... UserInput='ExistingStructure'; if exist(userInput, 'var') ...

3 dagen ago | 0

Answered
Group values of a vector into new vectors according to magnitude
A = [17 323 100 3 278 220 45 351 212 51] B = A(A>=0 & A<50) C= A(A>=50 & A<100) % Leave D for you

3 dagen ago | 0

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Answered
generating random numbers only 2 numbers
a = randi([0 1], [1 30])*3 + 1

3 dagen ago | 1

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How to get the file names that start with the same letter in the folder?
fn = dir('T*.*') % you can use 'T*.T', 'T15*.bin', etc

3 dagen ago | 0

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How to connect dots in figure?
% data x = randn(50, 6)*.5+(1:6); % 6 lines, 50 data points each line % if you really want to plot 50 lines, then: plot(x') ...

3 dagen ago | 0

Answered
combine different size vectors into one matrix
% use a cell array instead of separate variables e{1}=[2 3 4 5]; e{2}=[4 7 7]; e{3}=[8 8 7 4 2 5]; % find the longest vect...

3 dagen ago | 0

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Matlab 3D bar plot
xyz=[... 6.50319529000000 10 5 6.50463629000000 10 10 6.50548840000000 10 15 6.50607061000000 ...

4 dagen ago | 0

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How to combine and transpose arrays?
s1 = rand(5,1); s2 = rand(5,1); s3 = rand(5,1); s4 = rand(5,1); imp =[s1 s2 s3 s4]' % or imp1 = cat(2, s1, s2, s3, s4)' ...

4 dagen ago | 1

Answered
I need to read third coloumn and all rows of text file in matlab. Pls give your suggestions.
You can read all data (xyz.txt contains first part of your data). Then it is up to you to use which column of data. data = rea...

4 dagen ago | 0

Answered
How do I switch location of the largest and smallest elements of an array?
vect = randi(20,1,15) [~, imax] = max(vect) [~, imin] = min(vect) % swap tmp = vect(imax); vect(imax) = vect(imin); vect...

4 dagen ago | 0

Answered
Only graphing two out of three of my graphs
ch0 = ex32excel(:,2); ch1 = ex32excel(:,4); N = length(ch0); deltast = 2e-5; t1 = 0:deltast:deltast*(N-1); xlow=0.02394;...

4 dagen ago | 0

Answered
solving for complex numbers
A = 3+4j B = 3 -2j C = 2*exp(1j*deg2rad(50)) % Find out D yourself

4 dagen ago | 0

Answered
How to plot several signals in 3D
t = 0 : 10e-5 : 2e-2; y1 = sin(2*pi*50*t); y2 = sin(2*pi*100*t); f = [0 2 4]; plot3(t, f(1)*ones(size(t)), y1); hold on p...

4 dagen ago | 0

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Answered
How can I plot the graph?
x = 0:100; plot(x,carFunc(x)); ylim([0 30]) function output = carFunc(x) output = zeros(size(x)); idx = (x >= 75...

4 dagen ago | 1

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Answered
How to downsample a vector x by an integer factor M with a single statement such as for loop or conditional statements
a = 1:10; b = downsample(a, 3) % use downsample c = a(1:3:end) % statement

5 dagen ago | 0

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Answered
Why is MATLAB producing the wrong output with this function?
beamLoc = [10 200 300] b = FindDeflection((beamLoc)) function [beamDef] = FindDeflection(beamLoc) A = (1/3.19e9); beamDef = ...

5 dagen ago | 0

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Answered
print numbers to command window
With mapping toolbox, you can use angl2str. doc angl2str for more details. A = 0; B = 206.4188; C = -130.5507; A1 = angl...

5 dagen ago | 0

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Answered
Problem obtaining minimum negative value in an array
t = linspace(0,15,400); y = exp(-0.5*t).*cos(2*pi.*t); plot_cos(t, y) % plot t-y or y-t? function m = plot_cos(t, y) plot(y...

5 dagen ago | 0

Answered
display functions and coefficients from the basic fit tool box on a plot
xy = [3.25 0.801369; 3.375 0.883622]; x = xy(:, 1); y = xy(:, 2); f1 = @(x) 0.6580*x-1.337209; f2 = @(x) 0.0632*...

6 dagen ago | 0

Answered
display functions and coefficients from the basic fit tool box on a plot
Use your own fitting function: % Some data x = 0:.1:10; y = x.^2 +2*x + 3 +randn(size(x))*.4; plot(x, y) % fitting (polyf...

6 dagen ago | 0

Answered
Can MATLAB recognized the name of a variable with input function?
It's possible but it should be avoided if possible. milk = 30; %x = input('what is the name of the object? ', 's') % use this...

6 dagen ago | 0

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Answered
How to change yellow fill to white in 'mapshow'
p = shaperead('concord_hydro_area.shp'); mapshow(p, 'FaceColor', 'y') % change 'y' to 'w' for white

7 dagen ago | 0

Answered
a problem with transpose of Symbolic matrix
The bar over the variable means complex conjugate. ' means complex conjugate transpose, while traspose or .' means transpose wi...

7 dagen ago | 0

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Answered
fill missing point in data (x y z 3 columns data)
% Generate some data [x, y] = meshgrid(1:60, 1:50); x = x(:); y = y(:); z = 1./((x-30).^2+(y-20).^2); % make a square ho...

7 dagen ago | 0

Answered
How to Cell indexing
X1=11; X2=22; u{1}=[X1,X2]; u{1} % To access "one" element u{1}(1) u{1}(2)

7 dagen ago | 1

Answered
How can I have proper alignment in my output?
Try something like this to align the text: fprintf('%-30s', 'Numeric Daily Averages:'); fprintf('%10.2f ', rand(1,4)); fprintf(...

7 dagen ago | 1

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Answered
Indexing by using column names
A = zeros(3,1); B=rand(3,1); C=ones(3,1); T = table(A, B, C) VarNames = {'A', 'C'}; col_index = ismember(T.Properties.Variabl...

7 dagen ago | 1

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Answered
How to convert interval from to scalar. The problem is:
Do you mean a loop over a number of interals? k = -0.5:.05:-0.1; %(interval) for i=1:length(k) prob.Objective = k(i) * f...

7 dagen ago | 0

Answered
how to convert vector char to matrix char ?
You don't need to do anything. X is already an array. X = 'ABCDEFGHIJKLMNOPQRSTWXYZ' X(2) X(1,2)

8 dagen ago | 2

Answered
How can I write a magic(5) matrix to a text file with special delimiters?
x = magic(5); fid = fopen('test.txt', 'w'); fprintf(fid, '%f\n', x); % try different format here fclose(fid) type('test.t...

8 dagen ago | 1

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