issue with Drawnow

[Cleyderman Guerrero]

Hello Team,

I have the following issue when I execute my script. My script once worked
fine it, now, I have this issue. 

This is my script:

*clear all;
close all;
clc;

l1 = line (nan, nan, 'Color', 'r', 'LineWidth', 2);

ylim ([-.1 5.1]);
N = 1000;
fs=500;
xlim ([0 (N-1)/fs]);
grid
Stop = 1;
uicontrol('Style', 'Pushbutton', 'String', 'Stop', ...
    'Callback', 'Stop = 0;');
y1 = zeros (N, 1);
t1 = linspace (0, (N-1)/fs, N);
%t2 = linspace (0, (2*N-1)/fs, 2*N);

fl = '/home/pi/Desktop/adc0832/val.txt';
dl1 = ' ';

tic

while Stop

    if toc > inv(fs)
        tic

        var = load ('/home/pi/Desktop/adc0832/val.txt');
        %var = dlmread(fl, dl1);

        %d=var.data;
        %m=mean(d);
        y1 = shift (y1, -1);
        y1(end) = var;

        %test = conv(y2, cos(2*pi*2*t1));
        set (l1, 'XData', t1, 'YData', y1);
        drawnow

    end

end
close all
clear all
clc*


And the output is this:

No protocol specified
octave: unable to open X11 DISPLAY
octave: disabling GUI features
No protocol specified
No protocol specified

gnuplot: unable to open display ':10.0'
gnuplot: X11 aborted.
error: __go_draw_figure__: unknown object class, uicontrol
error: called from
    __go_draw_figure__ at line 187 column 13
    __gnuplot_drawnow__ at line 86 column 5
    adquisicionygraficacion.m at line 39 column 9
No protocol specified

gnuplot: unable to open display ':10.0'
gnuplot: X11 aborted.

gnuplot> nset obj 1;
         ^
         line 0: invalid command

could somebody help me with this? 

Best regards, 

Cleyderman Guerrero 




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