''Not enough input arguments'' error. help me (ekg/emg)

i am trying to connect arduino card + ekg/emg sheild to matlab but everytime this error pops out.

 Error using matlab_arduino (line 11)
 Not enough input arguments.

i couldnt see the problem. help me please. here is the code

 function matlab_arduino(nm) %function decleration 
 close all;
 clc;
 y=zeros(1,1000);
 delete(instrfind({'Port'},{'COM4'}));
 ps= arduino('COM4'); %connect to the arduino
 warning('off','MATLAB:serial:fscanf:unsuccessfulRead');
 cm=1;
 grid on;
 hold on;
 while cm<=nm
    ylim([0 5]);
    xlim([cm-20 cm+5]);
    y(cm)=ps.analogRead(0)*5/1024; %read the analog signal from arduino 
    plot(cm,y(cm),'X-r'); %plot the wave of the analog signal
    drawnow
    cm=cm+1; 
 end
 delete(ps);
 clear all;
 end

Answer 1

[Geoff Hayes]

halil - the error message is telling you that you are not passing enough inputs into the function matlab_arduino. Since there is only one input, I suspect that you are calling it as

 matlab_arduino

without passing in the nm input parameter. You need to figure out what this parameter should be (a number of some kind as it acts as an upper bound on the local variable cm) and pass it in as (for example)

 nm = 42;
 matlab_arduino(nm);