what is inline(vectorize function), also why to use fliplr for this?

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Dhairya
Dhairya 2022-11-14
评论： Walter Roberson 2022-11-15
clc
clear all
close all
syms x
f = input('Enter the function')
fL = input('Enter the interval on which the function is defined')
yr = input('Enter the axis of rotation')
iL = input('integration limits')
volume = pi*int((f-yr)^2,iL(1),iL(2));
disp(['Volume is: ',num2str(double(volume))])
fx = inline(vectorize(f));
xvals = linspace(fL(1),fL(2),201);
xvals = fliplr(xvals);
xivals = linspace(iL(1),iL(2),201);
xivalsr = fliplr(xivals);
xlim = [fL(1) fL(2)+0.5];
ylim = fx(xlim);
figure('Position',[100 200 560 420])
subplot(2,1,1)
hold on
plot(xvals,fx(xvals),'-b','LineWidth',2);
[X,Y,Z] = cylinder(fx(xivals)-yr,100);
figure('Position',[700 200 560 420])
Z = iL(1) + Z.*(iL(2)-iL(1));
surf(Z,Y+yr,X,'EdgeColor','none','FaceColor','flat','FaceAlpha',0.6);
hold on
plot([iL(1),iL(2)],[yr yr], 'r-', 'LineWidth', 2);
xlabel('X-axis');
ylabel('Y-axis');
zlabel('Z-axis');
view(22,11)

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采纳的回答

Chandler Hall
Chandler Hall 2022-11-14
编辑：Chandler Hall 2022-11-14
Vectorize just adds some '.' to a string so that it might be used as a vectorized function, i.e.,
>> vectorize('(x^3)/y')
ans =
'(x.^3)./y'
Why use fliplr? That's impossible to say because it actually has no effect at all. xvals is only used in the subsequent plot, which produces the same output if the vectors are in ascending order vs descending, and xivalsr is unused.

更多回答（1 个）

Steven Lord
Steven Lord 2022-11-14
Do not use inline. Its use has been discouraged for probably around 15 years now.
To convert a piece of text data to something that you can call as a function use str2func.
To convert a symbolic expression to something that you can call as a function use matlabFunction.
  2 个评论
Dhairya
Dhairya 2022-11-14
sir we have an exam tomorrow and this the only way we are taught
if possible could you please give some description about it?
Steven Lord
Steven Lord 2022-11-15
See the documentation for str2func and matlabFunction for examples of how to use each function.

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