loading a text file to GUI need help

iam trying to load a text file to gui to analyze the arrays in by using LOAD function but it keep showing error - is the load function correct or the are other function to load the text files to GUI????????

here is the begining of my code

load instru.txt

channels = instru(:,1);

totcounts = instru(:,2);

t=strnum(get(handles.edit1,string'));

x1=strnum(get(handles.edit2,string'));

x2=strnum(get(handles.edit3,string'));

y1=strnum(get(handles.edit4,string'));

y2=strnum(get(handles.edit5,string'));

totcounting = totcounts/t;

m=(y2 - y1)/(x2 - x1);

b=(y1-m*x1);

for V= 1 : size(channels)
    enrgy = m*channels + b;

end

enrgy =1:200;

plot(handles.axes1,enrgy,totcounting);

[Walter Roberson]

Please show the first few lines of instru.txt