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

Question

Dhairya 2022-11-14

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1850788-what-is-inline-vectorize-function-also-why-to-use-fliplr-for-this

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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Answer 1

Chandler Hall 2022-11-14

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1850788-what-is-inline-vectorize-function-also-why-to-use-fliplr-for-this#answer_1099748

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.