how to make a continuity graph ?

function op9_Callback(hObject, eventdata, handles)

% hObject handle to op9 (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

myform=guidata(gcbo)

a=str2double(get(myform.in1,'string'));

b=str2double(get(myform.in2,'string'));

c=str2double(get(myform.in3,'string'));

d=sqrt(a^2+(b-c)^2);

e=str2double(get(myform.in4,'string'));

f=str2double(get(myform.in5,'string'));

g=str2double(get(myform.in6,'string'));

h=(4*(e-1)*(f-1)*g*10^9)/(3*10^8);

pumanlos=13.54+39.08*log10(d)+20*log10(g)-0.6*(f-1.5);

set(myform.ou3,'string',num2str(pumanlos));

i=get(handles.in8,'string')

aa=str2double(i);

j=get(handles.in9,'string')

bb=str2double(j);

k=aa:bb;

plot(handles.axes3,k,pumanlos,'o')

Result

I want to create a continuous graph from the distance that has been input, but the results are like the following, is there something wrong with my coding? please help everyone

I Just wanna like this result

Thanks.

Answer 1

[Divyajyoti Nayak]

Hi @Rahmat,

The reason the plot from the code is not a continuous line curve but more of a scatter plot is because the y value specified in the “plot” function is a scalar (constant, as it is being calculated using “d”,”g”, and “f” which are all scalar) and the line specification ‘o’ creates circular markers instead of a line.

To fix this, the y values passed into the “plot” function should be a vector consisting of the function values at respective x-coordinate (values of “k”) and the line specifications should be ‘-’. Here’s a documentation link for the “plot” function which can help you:

https://www.mathworks.com/help/matlab/ref/plot.html

[Rahmat]

The problem has been found, thank you very much for your help.