data aqusition toolbox,an error

[EDIT: 20110527 07:57 CDT - reformat - WDR]

clear all;clc;close all

f_signal = 40000; % Orneklenecek isaretin frekansi 

T_signal = 1 / f_signal; % Orneklenecek isaretin periyodu 

f_sample = 160000;% Ornekleme frekansi 

T_sample = 1/f_sample;% Ornekleme periyodu 

T_bit = 2*power(10,-3);% Saniye cinsinden bit suresi 

T_frame = 1;% Bir cercevenin saniye cinsinden suresi 

blank = 276;%Frame'e 20 bit suresi kadar bosluk konacak 

barker_code_lenght = 13;

rate = 1 / T_bit; % Saniyede iletilen sembol sayisi 

data_length = T_frame/T_bit - 1 - blank - barker_code_lenght;

A_signal = 1;% Tasiyici isaretin genligi 

sample_number_per_bit = T_bit * f_sample;

h = [1 1 1 1 1 -1 -1 1 1 -1 1 -1 1];

h_barker = fliplr(h);

N = sample_number_per_bit;

h_barker2 = reshape(repmat(h_barker,N,1),1,N*length(h_barker));

AI = analoginput('nidaq','Dev1');

set(AI,'InputType','SingleEnded');

chans = addchannel(AI,8);

set(AI,'SampleRate',f_sample)

set(AI,'SamplesPerTrigger', f_sample*5);

set(AI,'TriggerType','Manual');

set(AI,'ManualTriggerHwOn', 'Trigger');

start(AI)

trigger(AI)

r = getdata(AI);

stop(AI);

r = r - 4.24;

t = 0:T_sample:5*T_frame-T_sample;

r1 = r.*cos(2*pi*f_signal*t');

r2 = -1i*r.*sin(2*pi*f_signal*t');

rp = r1 + r2;

rp_conv = conv(rp,h_barker2);

rp_conv2 = abs(rp_conv);

[max_rp_conv2,n] = max(rp_conv2);

R2 = r(n-length(h)*320:end);

R3 = R2(length(h)*320+1:end);

R4 = R3(1:(data_length+1)*320);

      % % % % % % % % % % DEMODULATION % % % % % % % % % % % %

t = 0:T_sample:(data_length + 1) * T_bit-T_sample;

Y1 = R4' .* cos(2*pi*f_signal*t);

Y2 = -1i*R4' .* sin(2*pi*f_signal*t);

y1 = sum(reshape(Y1,320,211));

y2 = sum(reshape(Y2,320,211));

y = y1 + y2;

decision = real( y(2:end) .* conj(y(1:end-1))) < 0;

received_string = sprintf('%i',decision)

word_phrase_receiver = char(bin2dec(reshape(received_string,7,[]).')).'

when i run this code, i get an error like

??? proje_uygulama_alıcı

                       |

Error: The input character is not valid in MATLAB statements or expressions.

how can i deal with this situation? what i do wrong?

please help me...

Answer 1

[Walter Roberson]

You appear to have saved the code in a file named "proje_uygulama_alıcı.m" . That name contains the character "ı" which is not one of the Latin characters (upper or lower case) or one of the digits or an underscore. Filenames for scripts or functions must obey the same rules as MATLAB identifiers. You will have to replace the "ı" with some other character.

[osman yurdakul]

thanks. how stupid i am :) :S thanks again...