Why am I getting the error "Invalid or Deleted Object"

232 views (last 30 days)
This is my code
%constants A and B calculations
y1 = Mean(1);
x1 = Mean_step(1);
initial = y1*x1;
y2 = Mean(2);
x2 = Mean_step(2);
constant_B = (x2*y2-initial)/(y1-y2);
constant_A=(initial)+((y1)*constant_B);
%model calculation
Model = constant_A./(Mean_step + constant_B);
hp = plot(Mean_step, Model, 'r-', 'Linewidth', 1.5);
%%%dynamic text
txt1 = ['V_{preamp} = ' num2str(constant_A) ' / (Tool-Substrate Gap + (' num2str(constant_B) '))'];
ht = text(400, 650, txt1, 'FontSize', 9);
txt2 = ['Current V_{preamp} value = ' num2str(Mean(k)) '| Current Z-piezo distance = (' num2str(Mean_step(k)) '))'];
ht2 = text(400, 600, txt2, 'FontSize', 9);
txt3 =['Current Z-piezo distance = ' num2str(Mean_step(k)) ''];
ht3 = text(400, 550, txt3, 'FontSize', 9);
txt4 = ['Percentage Change = ' num2str(percent_change)];
ht4 = text(400 , 500, txt4, 'FontSize', 9);
%animated line handle, the line after the trailing dot
hh=animatedline('Marker','o','MarkerSize', 3,'MarkerFaceColor',[0.2 0.2 0.2]);
%trailing dot handle
h = plot(nan, nan, 'yo', 'MarkerSize', 5, 'MarkerFaceColor', 'g','MarkerEdgeColor','g'); %yellow, filled, large
for k = 2:length(Mean)
y2=Mean(k);
x2=Mean_step(k);
constant_B=(x2*y2-initial)/(y1-y2);
constant_A=(initial)+((y1)*constant_B);
Model = constant_A./(Mean_step + constant_B);
hp.YData = Model;
txt1 = ['V_{preamp} = ' num2str(constant_A) ' / (Tool-Substrate Gap + (' num2str(constant_B) '))'];
ht.String = txt1;
addpoints(hh, Mean_step(k), Mean(k))
txt2 = ['Current V_{preamp} value = ' num2str(Mean(k)) ' V'];
ht2.String = txt2;
txt3 =['Current Z-piezo distance = ' num2str(Mean_step(k)) ' \mum'];
ht3.String = txt3;
txt4 = ['Percentage Change = ' num2str(percent_change)];
ht4.String = txt4;
set(h, 'XData', Mean_step(k), 'YData', Mean(k));
drawnow()
end
  1 Comment
Hans123
Hans123 on 9 May 2019
I think the handle is overwritten, I updated the question and pasted my original code

Sign in to comment.

Accepted Answer

Adam Danz
Adam Danz on 9 May 2019
Problem
First you produce a plot and assign the handle to hp
hp = plot(Mean_step, Model, 'r-', 'Linewidth', 1.5);
Then you destroy that plot and overwrite it with this line.
h = plot(nan, nan, 'yo', 'MarkerSize', 5, 'MarkerFaceColor', 'g','MarkerEdgeColor','g'); %yellow, filled, large
When you get to this line of code (below) hp is no longer a valid object since it was deleted.
hp.YData = Model;
Solution
Option 1: hold on.
hp = plot(Mean_step, Model, 'r-', 'Linewidth', 1.5);
hold on %now the 2nd line will be added to the plot
Option 2: new figure
figure()
h = plot(nan, nan, 'yo', 'MarkerSize', 5, 'MarkerFaceColor', 'g','MarkerEdgeColor','g'); %yellow, filled, large
% now the two lines will be on two different figures.
  3 Comments
Adam Danz
Adam Danz on 9 May 2019
Glad I could help. I knew to look for one of these:
  • delete(obj)
  • clear(obj)
  • more than 1 plot without a "hold on" <--- this was the culprit
  • Accessing an undefined variable <---- could have been this (we don't have values for several of your variables).
Hans123
Hans123 on 13 May 2019
thanks for showing me your thought process, really appreciate it!
cheers

Sign in to comment.

More Answers (0)

Categories

Find more on Graphics Performance in Help Center and File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!