error: number of rows must match (2 != 1) ... help

[Pol]

Hi there,

Many teachers is getting interested in octave in my school and one of
them gave me a bunch of m file about signal processing to translate to
Octave.

I already converted many of those file but I'm blocked in that script:


function y=multipath(xx,s);

for i=1:200
   a(i)=-inf;
endfor

if (strcmp(xx,'st'))
   z=[0];
endif

if (strcmp(xx,'ra'))
   z=[0 -4 -8 -12 -16 -20];
endif

if (strcmp(xx,'ht'))
   z=[-10 -8 a(2) -6 a(4) -4 a(5) 0 a(7:8) 0 a(10:11) -4 a(13:148) -8
a(150) -9 a(151:155) -10 a(157:170) -12 a(172:199) -14]; endif

if (strcmp(xx,'tu'))
   z=[-4 -3 a(3) 0 a(5) -2.6 a(7:8) -3 a(10:11) -5 a(13) -7 a(14:17) -5
a(19:23) -6.5 a(25:31) -8.6 -11 a(34:50) -10];%else
 %  disp('mauvaise entrée');
endif

m_tra=10.^(z/10);
y=filter(m_tra,1,s);
plot (y)

endfunction



That script is called from that script:


------8<--------
nbsymbols=input ('entrez le nombre de symboles: \n');
x=input('entrez le type de trajet: ','s');
snr=input('entrez le rapport S/N : ');

seq=data_gen3(nbsymbols);
mod=modulation(seq);
rot=rotation(mod);
filtre=fgauss(rot);
trajets=multipath(x,filtre);
bruit=noise(trajets,snr);
trajetbruit=bruit+trajets;
plot(trajetbruit)
------8<--------


now, this is the execution:


octave:1> progbruit 
entrez le nombre de symboles: 
1000
entrez le type de trajet: ht
entrez le rapport S/N :15
  1  0  0
  0  1  0
  0  1  0
  1  1  1
  0  0  0
  0  1  1
  1  1  0
  1  1  0
  0  1  0
  0  1  0
  1  1  0
  0  1  1
  0  0  0
  1  0  0
...
  1  0  1
  1  0  0
  1  0  1
  0  1  0
error: number of rows must match (2 != 1) near line 21, column 37
error: evaluating assignment expression near line 21, column 5
error: evaluating if command near line 20, column 1
error: called from `multipath' in file
`/home/pol/.octave/m/edge/multipath.m' error: evaluating assignment
expression near line 12, column 9 error: near line 12 of file
`/home/pol/.octave/m/edge/progbruit.m'
 octave:1> 

The line 21 in multipath.m is:
 z=[-10 -8 a(2) -6 a(4) -4 a(5) 0 a(7:8) 0 a(10:11) -4 a(13:148) -8
a(150) -9 a(151:155) -10 a(157:170) -12 a(172:199) -14];

I dont get where is the error ?

someone can help me ?

Thanks alot.

 -pol-



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