How can I multiply equation with number
显示 更早的评论
I need to multiply a number by an equation
function [result] = SA_1(func,lamda)
%UNTITLED Summary of this function goes here
% Detailed explanation goes here
syms a;
a=lamda;
f=a*func;
result=f;
end
when I run I get the following error
??? Undefined function or method 'mtimes' for input arguments of type 'function_handle'.
Error in ==> SA_1 at 6
f=a*func;
I need any help
采纳的回答
daniel.x16
2011-5-31
0 个投票
put a dot (.) before the * sign.
i.e. f=a.*func
3 个评论
Walter Roberson
2011-5-31
That will not solve the problem.
Eman Ahmed Elsayed
2011-5-31
Walter Roberson
2011-5-31
I doubt that. All that would do is change the error message from being about 'mtimes' to being about 'times'.
更多回答（1 个）
Walter Roberson
2011-5-31
Your line "a=lambda" overwrites the "syms a" that was established on the line above. You probably do not need the "syms a".
What you probably want is
function [result] = SA_1(func,lamda)
result=@(x) lambda*func(x);
end
This will construct a new function handle that includes the multiplication.
Warning: you won't be able to differentiate the new function handle either. Only symbolic expressions can be differentiated by MATLAB, unless you write the differentiation yourself.
类别
在 帮助中心 和 File Exchange 中查找有关 Symbolic Math Toolbox 的更多信息
2011-5-31
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
