Is concatenation of signals possible in matlab

I am trying to have a single graph, which has an exponential wave followed by an impulse and sine wave.

i can generated the signals independently.

My question is, how can i join the signals(like string concatenation).

Any idea is appreciated

[Chirag Gupta]

How are you generating the signals? Can you put some sample code in the question? If the signals are just vectors then you can just concatenate them like:

concat_signal = [exp_curve; imp_curve; sin_curve];

[Neels]

Hi thanks for the help. My program has the main program x.m which calls the subroutine y.m. I am trying to concatenate the two signals in the subroutine y.m

%% x.m

L=0.018

t_step= 0.1221

alpha= 0

L1=0.018

t_step1= 0.1221

alpha1= 0

m = y(L,t_step,alpha)+ y(L1,t_step1,alpha1);

%%y.m

function nt=y(L,t_step,alpha)

bt_new=0

ft_new=0

t_step=0.1221

vgroup = 2e8

it_new=0

t=-5:t_step:100

dx= (t_step*vgroup*1e-9)/2

N= L/t_step;

bt_new= exp(-alpha*t);

for l=0:2.0930e-03:N

ft = 10*exp(-((t-(l.*ones(size(t))*t_step)).^2-(2*l/vgroup))).*dx ;

ft_new =ft_new+ft;

end

yt= conv(ft_new,bt_new);

it= 20*log(yt)/log(10);

imp=zeros(size(t)*t_step);

imp(1.0)=1;

nt=[it;imp]

plot(nt,'-rx');

title 'intensity '

xlabel ''

ylabel ''

It shows the following error in the command window

Warning: Log of zero.

> In y at 26

In x at 9

Warning: Size vector should be a row vector with integer elements.

> In y at 28

In x at 9

??? Error using ==> vertcat

All rows in the bracketed expression must have the same

number of columns.

Error in ==> y at 31

nt=[it;imp]

Error in ==> x at 9

m = y(L,t_step,alpha)+ y(L1,t_step1,alpha1);

Answer 1

[Rick Rosson]

Please try the following:

   % Exponential signal:
   u = exp(...);

   % impulse signal:
   v = zeros(...);
   v(...) = 1;

   % Sine wave:
   w = cos(...);

   % Concatinate the three signals:
   x = [ u ; v ; w ] ;

The last line assumes that each of the tree signals is a column vector, where the rows are the discrete-time samples of the signals.

HTH.

Rick

Answer 2

[Jan]

See: help cat

Answer 3

[Praveen Suvarna]

 x = [ u ; v ; w ] ; command may not work in all cases... It will overlap one signal on another.

try x = [ u v w ] ; command also. It will help you out.