i get error using plot and error in color/lineup and i don't know what to do i have already attached the file if someone wanna see i want my program to run and show the high pass plot

i keep on getting this error saying error even after trying many times using plot and i dont know whats the problem it says

Error using plot

Error in color/linetype argument.

Error in matlabreport>pushbutton2_Callback (line 162)

plot(f,h);

Answer 1

[Geoff Hayes]

Mohammad - your attached file does not include the pushbutton2_Callback nor do I see any reference to an f or h. I can reproduce your error with this code

>> plot(1:10, 'hello')

where the second input, the string 'hello', is not a valid color or linetype argument. I suspect that you have the same problem with your h variable. What is it set to?

[Mohammad irfan]

thanks geoff for answering this is my code for pushbutton2_Callback

function pushbutton2_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton2 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
n=getappdata(0, 'num_2');
c=getappdata(0, 'num_3');
m=getappdata(0, 'num_1');
f= 0:0.01:(10*m);
s=2.*pi.*f;
h=((s.*n.*str2double(c))/(1+(s.*n.*str2double(c))));
h=num2str(h);
axes(handles.axes1);
plot(f,h);
xlabel ('frequency');
ylabel ('amplitude');
grid on;
axis auto;

[Geoff Hayes]

When I run the above code (with some dummy inputs), h becomes a 1x1 char with a value of '0' and so the plot function thinks that it should be a colour or line type. The code to set h is as follows

h=((s.*n.*str2double(c))/(1+(s.*n.*str2double(c))));
h=num2str(h);

Why are you converting it to a string with num2str? If I remove this line then h remains as an array and something is drawn on the axes...

[Mohammad irfan]

thank you very much geoff i got it now