Why is the EVAL command not able to execute when I pass a java string with variables in it?

2009 6 27
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Why is the EVAL command not able to execute when I pass a java string with variables in it?
The following code does not work properly
clear foo
jstr=java.lang.String('foo=3;'); % create java string
eval(jstr) % evaluate foo in this (caller) workspace
who foo
The following code generates an error
foo=3;
jstr=java.lang.String('foo*2');
bar=eval(jstr); % BUG!! foo exists but is not found
??? Undefined function or variable 'foo'.
Error in ==> D:\MATLAB6p1\toolbox\matlab\lang\@opaque\eval.m
On line 18 ==> varargout{1:nargout} = eval(tryVal);

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 采纳的回答

0 个投票

This is a bug in MATLAB when using the EVAL function with a java string with variables. Our development staff is currently investigating this issue.
As a workaround, you can convert the Java String to a MATLAB Character array before calling the EVAL function. For example:
clear foo
jstr=java.lang.String('foo=3;');
eval(char(jstr))
who foo

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