Help with integral2 calculator

kd
2018 4 21
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更新时间：2018 4 22
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I'm trying to create a basic double integral calculator. How do I refine the code I have so far?
fun = @(x,y) input('enter integrand = ')
xmin = @(y) input('enter lower x boundary = ')
xmax = @(y) input('enter upper x boundary = ')
ymin = @(x) input('enter lower y boundary = ')
ymax = @(x) input('enter upper y boundary = ')
Q = integral2(fun,xmin,xmax,ymin,ymax)

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Star Strider
Star Strider 2018-4-21

0 个投票

Use the str2func (link) function. I would also use vectorize (link):

fun = input('enter integrand = ', 's') 

fun = str2func(['@(x,y) ' vectorize(fun)])

Q = integral2(fun, xmin, xmax, ymin, ymax)

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Star Strider
Star Strider 2018-4-22

As always, my pleasure.

That becomes a bit more complicated, because you must test for a numeric input, and if it’s not numeric, then use str2func:

ymax = input('enter upper y boundary = ','s')
n = str2double(ymax);
if isnan(n)
    ymax = str2func(['@(x) ' vectorize(ymax)]);
else
    ymax = n;
end

You’ll need to do this in each limit, or at least those for which you expect a function input.

kd
kd 2018-4-22
Thank you so much. You probably saved me 3 days of trial and error.
Star Strider
Star Strider 2018-4-22
As always, my pleasure!
This is an interesting problem.

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