MATLAB: Step Plots Urgent Assistance Needed

[Altairs]

MATLAB : Step Plots [Urgent]

I am stuck at very crucial stage. I want to generate the step plot which is generated using step command in simple MATLAB environment. However, I am trying to incorporate it in GUI where it should plot the step plot when clicked on the button.

Following is the code for writing in normal MATLAB environment i.e. without GUI :-

m=1000;
b=50;
num=[1];
den=[m b];
cruise=tf(num,den);
Kp = 600;
Ki = 1;
contr=tf([Kp Ki],[1 0]);	
sys_cl=feedback(contr*cruise,1);
u=10;
t=0:0.1:20;
step(u*sys_cl,t)
axis([0 20 0 10])

Taken from http://www.engin.umich.edu/class/ctms/examples/cruise/ccpid.htm"

I am trying to put the same thing under the button callback and it just doesn't show on the axes I have made. The axes just disappear and nothing happens. However, the simple plot command works all right.

Following is my MATLAB code :-

function pushbutton1_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
axes(handles.axes1)
k=get(handles.edit1,'String');
Kp=str2num(k);
m=1000;
b=50;
u=10;
num=[1];
den=[m b];
cruise=tf(num,den);
sys_cl=feedback(Kp*cruise,1);
t=0:0.1:20;
step(u*sys_cl,t);
guidata(hObject, handles);

So how do I plot the unit step plot on those axis ? Is there someway to plot the step function using plot ?

 

[gtoguy97]

Yes, you can plot the step plot using the plot function in MATLAB. To do this, you would need to specify the coordinates of each step. For example, for a unit step plot with time values from 0 to 10, you can use the following code: t = 0:0.1:10; % Define time vector y = zeros(length(t), 1); % Preallocate y vector y(t>=0) = 1; % Assign a value of 1 to all values of t greater than or equal to 0 plot(t, y); % Plot the step plot

 

[oswaler]

I understand the urgency of your situation and I am here to provide assistance. The first thing to check is if your GUI is properly configured to display the plot. Make sure that the axes are correctly defined and that the plot function is properly called within the callback function. You can also try using the 'hold on' command before calling the step function to ensure that the plot is not overwritten by any other commands. If these steps do not work, you can also try using the 'plot' function instead of 'step' and manually creating the step plot using the unit step function. I hope this helps and please let me know if you need further assistance.