Hi I hope are well, I am making a serial interface for communication between C and matlab Pic by Proteus, but I get this error because it can be?

??? Attempted to access c(1); index out of bounds because numel(c)=0.

Error in ==> trabajopractico at 139 y(contador_ECG)=(c(1))*5/1024; and the code:

function trabajopractico(numero_Muestras)
  close all;
  clc;
  n=207300;
  y=zeros([1 n]);                    %%Vector donde se guardaran los datos
  for i = 1:n, y(i) = i; end
  delete(instrfind({'Port'},{'COM1'}));  
  PIC16F877A=serial('COM1');            %%vector para la comunicación serie 
  PIC16F877A.BaudRate=9600;             %%velocidad en baudios 
  PIC16F877A.DataBits=8;                %%Bits de datos igual a 8 
  PIC16F877A.StopBits=1;                %%un bit de parada 
  warning('off','MATLAB:serial:fscanf:unsuccessfulRead');
  fopen(PIC16F877A);                    %%Abre el puerto
  contador_ECG=1;
  msgbox('Recibiendo Señal ECG...');
%%Ventana para la Grafica PROTEUS:ECG
  figure('Name','PROTEUS: SEÑAL ECG');
  title('PROTEUS: SEÑAL ECG');
  xlabel('Número de Muestras');
  ylabel('Amplitud');
  grid;
  %%Bucle While para que tome y grafique las Muestras
  while contador_ECG<=numero_Muestras
  ylim([0 5.1]);                                %Limites del eje y
  xlim([contador_ECG-20 contador_ECG+200]);     %Limites del eje x
  c=fscanf(PIC16F877A,'%d')';                %Toma el valor recibido por el puerto y lo guarda en la variable
  y(contador_ECG)=(c(1))*5/1024;
  plot(contador_ECG,y(contador_ECG),'X-r');     %Grafica el potencial_A
  drawnow
  contador_ECG=contador_ECG+1;
  end
  %%Cerrando el Puerto...
  fclose(PIC16F877A);
  delete(PIC16F877A);
  clear  all;

Answer 1

[Stalin Samuel]

• The variable 'c'not having even a single element
• Make sure that 'c' receive the signal from Pic

[NiyuB]

thanks, good that the c variable must be in the programming of Pic c, is what you say? really I could not fix it, that error may be because since the pic is not receiving?