# VBBV

### PEC

Programming in MATLAB applied to interdisciplinary engineering fields

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display text when running exe in dos command window

function dispTest() % use the parenthesis anad try

20 hours ago | 0

Indexing in symsum-Funktion

syms n r phi % declare r and phi as symbolic also anz = 5; A = sym('A',[anz 1]) q = symsum(A.*r^n*cos(n*phi), n, 2, anz) %...

5 days ago | 0

How to idealize a moment curvature plot as a bilinear curve?

trapeziumarea(Xi,1) = 0.5*(v(Xi)+(Lastpoint(:,2)-Lastpoint(:,1)))*(v(Xi)/K); Trapezium area may be different as above ...

5 days ago | 0

How to update a plot while a simulation is running?

if fusedospa(i) > 2 % create plot hold on end Use *hold on*

7 days ago | 0

Why does this code fail?

fid = fopen('for1234.dat','w+'); fclose(fid) Since you are writing the data repeatedly to the same file, place the above f...

14 days ago | 0

plot using matlab(parabolic)

x = linspace(0.1,5,100); % may be parabolic y = 0.453 .* exp(-1.036 .* x) .* sinh((2.29.* x).^0.5); plot(x,y); Parabolic p...

14 days ago | 0

How to prepare extract monthly Data from a group of data?

A = readtable('https://in.mathworks.com/matlabcentral/answers/uploaded_files/1272440/AO_1950_2022.xlsx'); A.Properties.Variable...

14 days ago | 0

| accepted

'Index in position 1 is invalid. Array indices must be positive integers or logical values.', error in line 14 i.e., t1=D(ax(i),ay(i)).

clc clear all syms x y f=x*y^2;%input('enter the function:') p=diff(f,x); q=diff(f,y); [ax,ay]=solve([p,q],[x y]); ax=do...

15 days ago | 0

add constant value to row

A=readmatrix('DATA.xlsx'); % assuming DATA your filename A(:,end+1)=600; writematrix(A,'DATA.xlsx','Delimiter','tab') % writ...

16 days ago | 0

How to interpolate a set of data wher the X size is different for the Y size

Y=[1:14].';% 1 x 14 X=[1:2:5].'; % 1 x 3 Z=rand(14,3); % 14 x 3 [xq,yq]=meshgrid(1:0.0005:5,1:0.0005:14); % ...

17 days ago | 0

i want to plot the graph for while loop but the graph was blank

t(d)= t+h; %update T0 T0(d)= newT0;

18 days ago | 0

How to create a vector that repeats 5 values per increment in a for loop?

x = zeros(1,5); for ii=100:50:1000 x = [x ones(1,5)*ii]; end x(x==0) = []

19 days ago | 0

| accepted

how to get no of samples?

format long % this will explain why there are 298 samples a=1:10; no_samples=(10-1)/(10-1) %have to get 10 samples g=1:no...

19 days ago | 0

Connecting two Matlab scripts under one loop

A=100*rand(10,1); %input('enter wind speed mean\n'); %first part a = numel(A(A<0)); b = numel(A(A>10)); S = a+b; N = n...

19 days ago | 0

| accepted

Next value in alphabet

p = 'a' % e.g. user enters input letter nextLetter(p) % output of nextLetter function [next] = nextLetter(p) Alphabet = {'...

20 days ago | 0

Sound absorption coefficient of membrane backed with air cavity

clc clear all; f= (100:2:1600); omega= 2*pi*f; rho_s=0.265; T=76.53*(1+1j*0.005); D=0.1; a=0.05; % Fig 2 a c=343; rh...

21 days ago | 0

| accepted

convert matrix steps from 1 to 0.1

If you are plotting 0 to 0.1 sec using 1000 data points, the you have to divide it by frequency, 10 kHz data./10000 I...

24 days ago | 0

Unrecognized function or variable 'zvar'.

xlabel('xvar') ylabel('yvar') xlabel('zvar') If zvar, yvar and xvar are strings or numeric values passed to function ...

24 days ago | 0

Got this ''Empty sym: 0-by-1''

syms x; q = 1:3; w = 2; for k = 1:length(q) eqn = (3*x) + q(k) + w == 0; sol = solve(eqn,x); S(k) = double(vpa(sol,2)) ...

25 days ago | 0

One condition is not being fulfilled, and suddenly when i wrote on command window, give me a infinite menu, and i can not close it

clc, clear, close while true a=menu({'This program allows the fitting of functions to experimental points.', ... ...

26 days ago | 1

| accepted

how to solve one variable in non linear equation?

clc clear all T=12; u1=400;u2=8;a=30;b=5;a2=100;A=500;c2=10;c3=12;c4=8;D0=115; b2=0.2; a=-1.1;d=11.2;m=-0.5;k1=1.5;k0=1.1;k2=...

26 days ago | 0

How to create a loop?

clear all clc format longG; format compact; txt = input ('Choose a Production Period: 1) Annual 2) Monthly 3) Weekly 4) Dail...

26 days ago | 0

generate and save numerous datas in one code then load them in another code

% in A.m file [p,q] = B % call the function wbich returns those outputs variables (values) n = p + q % add them directly as...

28 days ago | 0

Precision of rounding numbers

D = 1/(0.1*0.00001) fprintf('%.2d',D) % try using %d format specifier As you are using %f it is meant for floatpoint num...

29 days ago | 0

Open an "array" of filenames

Its possible to open multiple files as you intend. Use the sprintf function to open individual filenames identified using an in...

29 days ago | 0

Char not working properly ?

To display text on figure window, you should rather use uilabel function in place of uitextarea which produces same output as de...

29 days ago | 0

During matching process I want distinct Number but I am getting same number for few data set. Is there any command to get distinctive number always.

Use *unique* function.

29 days ago | 0

Where is the mistake? Taylor Series in matlab?

syms T alpha = 0.056; beta = 0.0000186; R = 2000; f = R*(alpha+0.0078*(T-25)+beta*(T-25).^2); f = subs(f,T,80); tayl...

1 month ago | 0

| accepted