Chunru

Last seen: Today | Active since 2013

Matlab user since 1990

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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

8 hours ago | 0

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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 = ...

9 hours ago | 0

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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...

10 hours ago | 0

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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...

10 hours ago | 0

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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*...

1 day ago | 0

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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...

1 day ago | 0

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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...

1 day ago | 0

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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

2 days ago | 0

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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...

2 days ago | 0

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fill point in 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...

2 days ago | 0

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

3 days ago | 1

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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(...

3 days ago | 1

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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...

3 days ago | 1

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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...

3 days 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)

3 days 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...

3 days ago | 1

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Answered
with a function y(x) how can i plot 2y(3-x)
syms x y = piecewise(x<0, 0.1*x^2, x>0, .5*x) g = subs(y, x, 2*x) fplot(g)

3 days ago | 1

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Answered
Does "insertText" not support Chinese fonts? How do I add Chinese fonts to my images?
I = imread('peppers.png'); % Find out the Chinese Fonts installed in your system % listTrueTypeFonts I=insertText(I,...

3 days ago | 0

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How do I only display the rows for when column 1 is > 0 when I have 4 columns with corresponding data to the first column
a = [-0.00502163330810033 -0.00535602354270113 -0.00175905055456396 -0.00195122013126169 0.0191518806112861 0.02329682192...

4 days ago | 0

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Bubble sort error line 1
You code can run. if you use "input", key in the following "[1 3 2 5 2]" without quotes. %cases = input('Enter cases with [ ] ...

4 days ago | 0

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How to plot a piecewise function on Matlab?
You can try the another function. syms f(x) f(x) = piecewise(x<=5, 1-sqrt(5-x), 5<x<7, 1, x>=7, 1-sqrt((x-7)/3) ) fplot(f, [0...

4 days ago | 0

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Answered
"Fixed point" binary sequence for values between 0 and 1
% Given x in [0, 1) x = 0.5234567 % Number of bits in binary (bits after .) n = 32; b = dec2bin(x*2.^n, n); b=['0.' b]

4 days ago | 0

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finding the max number?
x=[1 3 5 7] y=x.^2+5 % use .^ here [~, idx] = max(y) % idx the where y is the max x(idx) ...

4 days ago | 0

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I need to find the length of an array for values > 0
a = [1 2 0 3 -1 2 0]; n = sum(a~=0)

4 days ago | 0

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Partial pivoting row swapping
a=[1 4 3 5;2 0 2 6;1 1 0 5;1 2 3 4]; b=[5;6;7;10] ab=[a b] for i=1:size(ab, 1)-1 % pivoting [~, imax] = max(abs(ab(...

4 days ago | 0

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Answered
Right align text in subtitle
figure; plot(randn(10,1)) t = title({['\fontsize{14}','First line']; ... ' '}, ... 'FontWeight','Normal'); axPo...

4 days ago | 0

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Answered
m=1:24*(T^-1);
T = 2 % Given a number T T^-1 % T^-1 is 1/T m=1:24*(T^-1) % m is from 1 to 24/T=12 with default step of...

5 days ago | 0

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Answered
What is the easiest way to remove a vector from a matrix?
a = magic(4); a = [a; a(1, :); a]; % 1st 5th and 6th rows are the same a y = a(1, :); % the vector inpu...

5 days ago | 0

Answered
Issues with contour plot of f(x, y) = x/y.
You just need to remove the level=0 which result in x=0 (not y=0) being plotted. x = -5:.1:5; y = -5:.1:5; [X,Y] = meshgrid(x...

5 days ago | 0

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Answered
reading 10 values randomly from txt file
% Generate the text file n = 200; % 5000 x = randi(100, n,1); fout = fopen('test.tx', 'wt'); fprintf(fout, '%f\n', x)...

5 days ago | 1

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