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# VBBV

### PEC

729 total contributions since 2017

Programming in MATLAB applied to interdisciplinary engineering fields

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How to construct this matrix without using two for loops?
%if true A = V'.* X.*V;

6 hours ago | 0

graph won't appear
%if true zi = 0.2; % define the value of dam r = 0:0.05:10; % define the range T = sqrt(1+(4*(zi^2)*(r.^2)))./ sqrt(((1-...

6 hours ago | 0

nested if-else inside nested if-else
%if true function output = blur(img,w) img(:) = double(img(:))+1; [row col] = size(img); output = zeros(row, col); fo...

11 hours ago | 0

Use data in an array for 'Plot' command
%if true plot([shape(j,4,i) length(shape(j,4,i)) shape(j,4,i)(1)],[shape(j,5,i)(length(shape(j,5,i))) shape(j,5,i)(1)],'k'...

15 hours ago | 0

How to plot(x,y) if x = f(y) is given
%if true C_0 = 12 ; T_l = 903 ; m = -2.5 ; sigma_star = 0.0666; k = 0.0208 ; x = 0:20; y = - m*C_0*(2*sigma_star.*x...

1 day ago | 0

Matlab plot problem line 13
%if true plot(y, double(subs(dydt(y, E, r,K))));

2 days ago | 1

| accepted

I dont know where i was wrong
number = str2num(a(i:i+4)); % missing parenthesis Missing parenthesis

2 days ago | 0

Trying to plot a sine+sine function but not getting a smooth curve
%if true f = 2 V = 1; A= 1; L = 1; LL = V/f B = 2*pi/LL t = 0; W = 2*pi*f x = 0:0.0001:L; z1 = A*sin(B*x-W*t) z2 = A*si...

2 days ago | 0

Parentheses error with a function call
%if true x = load('mnist.mat', 'testX'); k=5; numIter=6; function [mu, cll, ill] = gmm(x, k,numIter) Assign _x_ dir...

2 days ago | 0

| accepted

Why I am getting the error "Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters."
%if true for i = 1:NF err_frame(:,i) = err((i-1) * (1- % ^ ' is used for transpose OLR) + 1*(i-1) * frame_l...

2 days ago | 0

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Why does not semilogy works?
%if true figure(1); %hold on nnmax= size(data.file,1); for kk=1:1:nnmax semilogy(data.x(:,1:kk), data.y(:,1:kk)); ...

3 days ago | 0

How to make Subscript indices real positive integers or logicals?
clc; clear; x = linspace(-1,1,100); %-1:.01:1; y = linspace(-1,1,100); %-1:.01:1; z = linspace(-1,1,100); %-1:.01:1; f=z.*...

4 days ago | 0

How to run if and exist ?
final_residuals = [] for year= 1962:2016 for id=10000:93436 sub_regress = subsetPCA(subsetP...

4 days ago | 0

ajdk ahdjkfha haldjf (ignore)
w = .5; %% 2w=1 x = -.5:0.1:.5; %% X (-w,w) N = [5, 9, 20]; %% N [5,9,20] delta = 2*w./N % Matrix for ...

5 days ago | 0

Plotting results of fft2 with frequencies in the x and y axes
%if true surf(yq,yp,rYQ);

5 days ago | 0

histogram of angles in a loop
%if true matrix(i,:)= [i;j;angle]; Did you use increment this way to store matrix

5 days ago | 0

How to change X axis in the form of percentage
%f true x = 77:146; xp = (x./max(x))*100 plot(xp,yp)% yp is your initial y values

5 days ago | 0

Magnitude and phase spectrum of sine wave using FFT
%f tru subplot(2,1,2); plot(w(1:plot_FFT_len), 20*log10(abs(fftd./Plength)).*(1:plot_FFT_len));

6 days ago | 0

Plotting a projectile (it doesn't plot anything)
%if true plot(Hsx, 'b-', 'LineWidth', 3); grid on; grid minor _Vsy_ is scalar with one value. That's why plot ...

7 days ago | 0

double type+ surf error
Check if _b_ matrix has any *NaN* values. Due to presence of text elements

7 days ago | 0

Plotting the Bar chart in Matlab
%if true x = [1 2 3]; figure, bar(x,[3 6 9;2 5 8;1 4 7]) Do you mean this ?

7 days ago | 0

How to clear a particular figure and replace it with other
%f true clf hold all fplot(f,'g') xlim([-1,3]) ylim([-2,2]) f1 = figure plot(0,0,'bo'); clf(f1,'reset') plot(0,1,...

8 days ago | 1

| accepted

Logical Indexing with Condition Involving Functions
%if true idx = find(A(a) == 1) Use it with _find_ function for element indices

9 days ago | 1

Can you have lines between circles on a scatter plot?
%if true a = [50:199]; b = [75:224]; i = [1:150]; scatter( i, [a;b] );hold on; for k = 1:length(a) line([i(k) i(k)],[...

9 days ago | 0

I am getting this Error using makeState (line 56). Your fitness function must return a scalar value.
%if true MWh = k'.*X(1:N).'/c(4); From the error, the function must return a scalar which is possible with above chang...

10 days ago | 0

| accepted

Fourier series using matlab
Use _x_ in place of _n_ as it appears in other equations too.

10 days ago | 0

plotting a straight line with slope and a single point
%if true %%%Y-Values Stress_fail_GF=[1.2 2.1]; Stress_fail_AF=2.8; Stress_fail_Matrix=0.1; %%%X-Value Strain_fail_GF=[0....

10 days ago | 0

Generate sequence of sine waves with changing amplitude
%f true f = 2.36e3; w = 2*pi*f; %sampling frequency fs = 50000; dt = 1/fs; %Amplitude of pickup signal at each of 11 d...

10 days ago | 0

| accepted