Not enough input arguments

Hi, I've been trying to do a coding for FM Modulating Signal but when using the code below, I got a "not enough input arguments" error. Would really appreciate it if anybody could help. Thank you!

fs=100;

ts=1/fs;

fd=25;

t=(0:ts:0.5-ts)';

x=sin(2*pi*4*t);

MOD=comm.FMModulator('SampleRate',fs,'FrequencyDeviation',fd);

ym=step(MOD,x);

subplot(2,1,1);

plot(t,[x real (ym)]);

xlabel ('Time')

ylabel ('Amplitude')

title ('Modulated Signal')

the error :

Error using real

Not enough input arguments.

Error in lab4dm (line 11)

plot(t,[x real (ym)]);

Answer 1

[the cyclist]

You need

real(ym)

instead of

real (ym)

[kiroro00]

Didn't realize that the space could cause errors. Got the output that I expected, thanks!

[Stephen23]

"Didn't realize that the space could cause errors"

Because it means that you are using command syntax:

https://www.mathworks.com/help/matlab/matlab_prog/command-vs-function-syntax.html