Answered
How to return a row from a 2d matrix
A= [52 53 17 10 8; 16 12 7 14 23; 24 90 1 19 36; 4 3 21 11 18] B= [30 52 7 10 80;5 20 22 7 43; 4 2 1 9 6] idx=ismember(A,B...

10 years ago | 0

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how to get the value of function u(x,t)=exp(ax+bt) in form of table for diffrent value of x and t
You use <http://www.mathworks.com/help/matlab/ref/table.html table> function to create your table

10 years ago | 0

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Solve non-linear system equation in matrix form
look at this example syms a b c eq=[a 2 3;a b 1; c 5 4]*[a 2 3;a b 1; c 5 4]==randi(3,3,3) out=solve(eq)

10 years ago | 0

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How can I convert the 8*8 matrix a to 4*4 matrix b using downsample
A(1:2:end,1:2:end)

10 years ago | 0

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How to read data from a .txt a put it in different vectors?
v=importdata('file.txt') You will get a matrix containing nan values, it's not recommended to create multiple variables. Wi...

10 years ago | 0

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Answered
Explicitly numbered string?
numbers=3; fname=genvarname(repmat({'Q'},1,numbers),'Q') for ii=1:numbers x = -(ii+1)*pi:0.01:(ii+1)*pi; y = sin(x...

10 years ago | 0

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how to add element in vector?
v=[] a=10 v=[v a]

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Subscript indices must either be real positive integers or logicals.
You cant use an index equal to zero, Matlab allows only positive integer indices, or logical indices

10 years ago | 0

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how to plot step response from an unknown first order system?
Unknown first order system should have an unknown step response. If your system is stable, you normally can see the steady stat...

10 years ago | 0

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creating several subplots with for loop
t=1:100; y=rand(80,100); for k=1:5:size(y,1); s=y(k:k+4,:); figure; for ii=1:5 subplot(5,1,ii); ...

10 years ago | 1

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Answered
'' Attempted to access sorted_evalue(0); index must be a positive integer or logical. '' how to remove this??????
The error is du to sorted_evalue(0). In Matlab the indices begin at 1, the 0 is not allowed

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Answered
Applying Unit Step to discrete signal
you can use <http://www.mathworks.com/help/symbolic/heaviside.html heaviside> function

10 years ago | 0

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is it possilbe to get a CD for installing the software
You can download without installation, then make your CD. <http://www.mathworks.com/help/install/ug/download-only.html>

10 years ago | 0

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How to fix Attempted to access P(1.01); index must be a positive integer or logical error
The index should be positive and integer. In your case the index is equal to 1.01, which is not integer

10 years ago | 1

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How can I randomize elements in an array by a set amount?
a = [5,5,5,5,5]; out=a+randi([-1 1],size(a))

10 years ago | 1

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Answered
how do you convert a continuous-time subsystem to a discrete-time subsystem in Simulink?
You place your continuous system between a zoh block and a quantizer block <</matlabcentral/answers/uploaded_files/46024/ans...

10 years ago | 0

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How do I format an array of values to a specific number of digits?
Y = [1;2;3;4;5] out=sprintf('0%d\n',Y)

10 years ago | 1

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Answered
Random multiply by negative one
out=2*randi([0 1],22528,1000)-1

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How to say not equals to for 3 variables
a~=b & a~=c %or you can use ismember function ~ismember(a,[b,c])

10 years ago | 0

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Error using plotyy in for loop
E1=30e6; E2=.75e6; G12=0.375e6; v12=0.25; x=0:0.5:90 Ex=1./((1./E1*cosd(x).^4)+((1./G12-2*v12/E1).*(sind(x).^2).*(cosd(x)...

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Answered
How to generate variable sine wave after fixed number of samples
np=25 f=50 t=0:T/10:T; y=sin(2*pi*f*t); for k=1:19 f=f+50; T=1/f; t1=t(end)+T/20:T/20:t(end)+np*T; y1=...

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Answered
to combine different vectors with the same element
out=union([1 2 3 4], union([2 4 5],[ 1 5 6])) %or out=union([],cat(2,[1 2 3 4], [2 4 5],[ 1 5 6]))'

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Answered
Hi, I am getting error on secant problem.
There is no error in your function. To call it: fun=@(x)exp(-x)-x Xa=0 Xb=1 tol=0.001 n=3 Xs=secantroot (fun,Xa,Xb,tol...

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Answered
Sorting sub matrices based on specific column value
a=[22 0.008 6.2 2 0.008 5.2 42 0.014 4.7 23 0.016 6.7 43 0.016 7.2 3 0.016 2.2] b=a; b(:,4)=abs(b(:,3)-7) [ii,jj,kk]=u...

10 years ago | 1

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How to insert space to a string given
If you haven't the original text, how Matlab will know where the spaces are located? At least when you remove the spaces, save t...

10 years ago | 0

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index must be a positiv integrer or logical
The index can't be equal to 0, you can't write A(0) The index should be a positive integer or logical

10 years ago | 0

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Answered
how can find a point from an array where the points it follows start to decrease
%Example t=0:0.1:20 y=sin(t) plot(t,y) %--------------------- ii=diff(y)>0 jj=strfind(ii,[1 0]) tout=t(jj) yout=y(jj)

10 years ago | 0

Answered
I have to declare 6 variables with the constraint 0<=a1<b1<c1<a2<b2<c2<=255. How to do it? please help.
You can check using this test test=0<=a1 & a1<b1 & b1<c1 & c1<a2 & a2<b2 & b2<c2 & c2<=255

10 years ago | 0

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Fixing Error "Subscript indices must either be real positive integers or logicals."
I think you missed the multiplication operator * I1 = Io*(((2.*besselj(1,q).*((pi.*q)/(lam1.*N))))/(((pi.*q)/lam1.*N))).^2;...

10 years ago | 0

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Answered
How to plot components of a cell array?
w={[1,9,212] [4,12,200] [5,12,180] [6,12,200] [9,15,200] [10,15,200]} v=cell2mat(w') plot3(v(:,1),v(:,2),v(:,3))

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