clk=handles.metricdata.clk;
y=handles.metricdata.y;
x=handles.metricdata.x;
input_signal=handles.metricdata.input_signal;
i=1;
if strcmp(handles.metricdata.currentout,'checked')==1
    p_out{i}='clk, y';
    i=i+1;
end
if strcmp(handles.metricdata.voltageout,'checked')==1
    p_out{i}='clk, x';
    i=i+1;
end

if strcmp(handles.metricdata.voltagein,'checked')==1
    p_out{i}='clk, input_signal';
    i=i+1;
end

Output_Plot=strjoin(p_out,', ');
Output_Plot
plot(Output_Plot);

Error using plot
Invalid first data argument.

Error in RTD_Simulator_Outputs>Run_Plot (line 287)
plot(Output_Plot);

clk, y, clk, x, clk, input_signal