How to replace string but not function

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Ravi Goyal
Ravi Goyal 2016-10-18
评论： Ravi Goyal 2016-10-21
Dear Community,
In a string like: 'sinh(x).*f.*n'
I want to replace the n with X_Model(1). Using strrep however I end up with
siX_Model(1)h.*f.*X_Model(1)
which means that the n in sinh was also found to be an n and replaced. How can I make it exclusiv, so only if it matches exactly the replacement does take place? In a Matlab Script using 'Find and Replace' I can make this happen when I click 'Match Case' and 'Whole Word', so I want to have this functionality in a function.
Thanks and best Regards Ravi

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采纳的回答

Sean de Wolski
Sean de Wolski 2016-10-18
编辑：Sean de Wolski 2016-10-18
This can be done elegantly and safely with Symbolic Math Toolbox
syms x f n model(ix)
expr = sinh(x).*f.*n
subs(expr,n,model(1))
  2 个评论
Ravi Goyal
Ravi Goyal 2016-10-19
Thanks Sean,
Would you know of any way not using the Symbolic Math Toolbox? Best Regards Ravi
Sean de Wolski
Sean de Wolski 2016-10-19
Not a safe way that is completely fool proof.

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更多回答（1 个）

Jan
Jan 2016-10-19
编辑：Jan 2016-10-19
Str = 'sinh(x).*f.*n'
Str2 = regexprep(Str, '\bn\b'
I cannot test this currently.
[EDITED]
Str2 = regexprep(Str, '(?:^|\W)n(?:$|\W)', 'X_Model(1)')
  3 个评论
显示 1更早的评论
Jan
Jan 2016-10-19
编辑：Jan 2016-10-19
@Ravi: See [EDITED] Please test this exhaustively, because I'm not a regexp hero.
Ravi Goyal
Ravi Goyal 2016-10-21
Thanks Jan,
It does the job for the n but then fails for the normal replacement of x in sinh(x) by getting rid of the brackets...I guess i gotta go somehow with the symbolic toolbox or just leave it a known bug.

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