blocks|key|5134172|text|不，你不能这么做。Matlab中的匿名函数只返回一个值。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5134173|相反，您可以在deal周围定义一个薄包装器，并将包装器作为句柄进行传递：|offset|length|style|CODE|5134174|function+[a+b+c]+=+wrapper(t,y)
++++[a+b+c]+=+deal('some+stop+condition',+1,+0);
end

opt+=+odeset('Events',+@wrapper);

[T,+Y]+=+ode45(@odefun,+[tstart+tend],+y0,+opt);|code-block|syntax|javascript|5134175|entityMap^0|0|7|4|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@$D|Q|E|R|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|S|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

No, you can't do it. Anonymous functions in Matlab only ever return one value.

Instead, you could define a thin wrapper around <code>deal</code> and pass your wrapper as a handle:

<pre><code>function [a b c] = wrapper(t,y)
 [a b c] = deal('some stop condition', 1, 0);
end

opt = odeset('Events', @wrapper);

[T, Y] = ode45(@odefun, [tstart tend], y0, opt);
</code></pre>

blocks|key|1784189|text|我注意到这篇文章在寻找同样问题的答案。这意味着，对于某些人来说，这个问题可能仍然有效。既然我最终自己找到了解决方案，我想给出一个有点“过时”的答案。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1784190|实际上，是的-这是可能的，但不是直接的。试试这个：|1784191|evnt_fun+=+@(t，f)subsref({'some+stop+condition'，1，0}，struct('type'，'{}'，'subs'，{{':'}}))；|1784192|我不能完全检查代码的向后兼容性。但是，它适用于R2011和更高版本的MATLAB。|1784193|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

I noticed this post looking for the answer to the same question. This means that for some people the question may be still valid. Since finally I found the solution by myself, I'd like to give a little bit "outdated" answer.

Actually, yes - it's possible but not straightforward. Try this:

evnt_fun = @(t, f)subsref({'some stop condition', 1, 0}, struct('type', '{}', 'subs', {{':'}}));

I'm not able to fully check the backward-compatibility of the code. However, it works with R2011 and later MATLAB versions.

blocks|key|1784223|text|此外(这是游戏中很晚才添加的，但这让我很沮丧)。下面是一个包含嵌套函数的解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1784224|function+[+dealfunchandle+]+=+dealwithit(+arrayfunc+)
%25+Takes+as+input+an+event+function+of+(t,z)+that+returns+a+3+array+(in+same+order+as+event+syntax).

++++function+[a,+b,+c]+=+dealfunc(t,z)
+++++++output+=+arrayfunc(t,z);
+++++++a+=+output(:,1);
+++++++b+=+output(:,2);
+++++++c+=+output(:,3);
++++end

dealfunchandle+=+@dealfunc;
end|code-block|syntax|javascript|1784225|此函数只需编写一次(如果您必须使用许多不同的事件函数，则非常方便)。这可用于在代码中生成匿名事件函数，如下所示：|1784226|arrayfunc+=+@(t,y)+[y(1),+0,+1];
events+=+dealwithit(arrayfunc);

opts+=+odeset('Events',+events);|1784227|然后按正常方式执行ode45。|1784228|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Also (this is very late in the game to be adding to this, but this frustrates me). Here is a solution with nested functions:

<pre><code>function [ dealfunchandle ] = dealwithit( arrayfunc )
% Takes as input an event function of (t,z) that returns a 3 array (in same order as event syntax).

 function [a, b, c] = dealfunc(t,z)
 output = arrayfunc(t,z);
 a = output(:,1);
 b = output(:,2);
 c = output(:,3);
 end

dealfunchandle = @dealfunc;
end
</code></pre>

This function only has to be written once (handy if you have to use lots of different event functions). This can be used to generate an anonymous event function within the code as follows:

<pre><code>arrayfunc = @(t,y) [y(1), 0, 1];
events = dealwithit(arrayfunc);

opts = odeset('Events', events);
</code></pre>

And then ode45 as per normal.

Is it possible to use an anonymous function as an event function in Matlab. What I want to do is basically

<pre><code>opt = odeset('Events', @(t,y) (deal(y(end)-t^2,1,0)));
[T,Y] = ode45(@odefun,[tstart tend],y0,opt);
</code></pre>

However, this returns an error complaining that the number of outputs to deal must be matched exactly. Is there some other way to make the anonymous function return multiple arguments?

Is it possible to use an anonymous function as an event-function when solving an ODE in Matlab

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

文章

问答

视频

学习中心

腾讯云实验室

直播

竞赛

腾讯云代码分析专区

腾讯iOA零信任安全管理系统专区

腾讯云架构师技术同盟交流圈

腾讯云数据库专区

腾讯云顾问专区

腾讯云原生专区

腾讯混元专区

腾讯云TCE专区

腾讯云Lighthouse专区

腾讯云HAI专区

腾讯云Edgeone专区

腾讯云存储专区

腾讯云智能专区

腾讯轻联专区 

腾讯云开发专区

TAPD专区

腾讯轻量云游戏服专区

腾讯云最具价值专家

腾讯云架构师技术同盟

腾讯云创作之星

腾讯云开发者先锋

腾讯云代码助手

云原生构建

TAPD 敏捷项目管理

Cloud Studio

SDK中心

API中心

命令行工具

涵盖代码开发、场景应用、自动测试全流程，助你从零构建专属AI助手

一站式MCP教程库，解锁AI应用新玩法

在Matlab中可以使用匿名函数作为事件函数吗？我想要做的基本上是opt = odeset('Events', @(t,y) (deal(y(end)-t^2,1,0)));[T,Y] = ode45(@odefun,[tstart tend],y0,opt);但是，这将返回一个错误，报告要处理的输出数量必须完全匹配。...

问在Matlab中求解常微分方程时，是否可以使用匿名函数作为事件函数
EN

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问在Matlab中求解常微分方程时，是否可以使用匿名函数作为事件函数EN