Plotting issues with labeling axis and giving titles

4 次查看（过去 30 天）
Austin Duncan
Austin Duncan 2019-4-23
回答： Adam Danz 2019-4-23
I have commented out the titles and labels as the program runs fine without them but when i uncomment them it still graphs but gives and Index exceds array bounds and dosnt label or title the graph. pls help
R_A1 = -2250;
R_P1 = 3750;
% Plot for shear force
x_beam = 0:.1:5; %length of beam
syms x
y = piecewise(x<2, R_A1, 2<=x<5, R_A1 + R_P1, x ==5,0)
subplot(3,2,1)
% title('Shear Force Diagram')
% xlabel('distance along beam (m)')
% ylabel('Shear Force (N)')
fplot(y)
xlim([0 5])
ylim([-2500 2500])
  2 个评论
Adam Danz
Adam Danz 2019-4-23
编辑：Adam Danz 2019-4-23
No error when I run it. However, you must move the calls to title(), xlabel(), and ylabel() to after fplot() --or-- include the handle to the subplot axes as the first input to fplot().
Please provide the full copy-pasted error message.
Austin Duncan
Austin Duncan 2019-4-23
this is the response even after the code is moved until after fplot()
Index exceeds array bounds.
Error in Diving_Board_MD (line 33)
title('Shear Force Diagram')

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回答（2 个）

Walter Roberson
Walter Roberson 2019-4-23
You accidentally created a variable named title which is interfering with calling the function named title
Adam Danz
Adam Danz 2019-4-23
My hunch is that 'title' is a variable in your data and no longer represents matlab's builtin function of the same name.
This reproduces your error:
title = 123456;
title('Shear Force Diagram')
% result:
error: Index exceeds array bounds.
To confirm this,
which title
If title is a variable you'll see: title is a variable.
If title is matlab's function you'll see something like:
C:\Program Files\MATLAB\R2019a\toolbox\matlab\graph2d\title.m
Solution: don't use "title" as a variable name.

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