Replacing substring not working

Question

ludolfusexe 2024-5-27

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2122931-replacing-substring-not-working

评论： ludolfusexe 2024-5-27

Why isn't this working?

toBeChanged = "\dot{h}_j(\phi_j,x,y) = \delta _{u}-\delta _{l}\,{\mathrm{e}}^{-\frac{{\left(q_{\mathrm{jx}}-x\right)}^2+{\left(q_{\mathrm{jy}}-y\right)}^2}{2\,\sigma ^2}}\,\phi_j";
toBeRemoved =                                                  "{\mathrm{e}}^{-\frac{{\left(p_{\mathrm{jx}}-x\right)}^2+{\left(p_{\mathrm{jy}}-y\right)}^2}{2\,\sigma ^2}}";
isContained = contains(toBeChanged,toBeRemoved)
isContained = logical
   0
newString   = replace(toBeChanged, toBeRemoved,"{h(p,q_j)}");

Doing this with other smaller strings works just fine.

2 个评论
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Mathieu NOE 2024-5-27

在 MATLAB Online 中打开

you made a slight error when doing the copy paste ...

toBeChanged contains left(q_

and

toBeRemoved contains left(p_

if you make the correction , it works

toBeChanged = "\dot{h}_j(\phi_j,x,y) = \delta _{u}-\delta _{l}\,{\mathrm{e}}^{-\frac{{\left(q_{\mathrm{jx}}-x\right)}^2+{\left(q_{\mathrm{jy}}-y\right)}^2}{2\,\sigma ^2}}\,\phi_j";
toBeRemoved =                                                  "{\mathrm{e}}^{-\frac{{\left(q_{\mathrm{jx}}-x\right)}^2+{\left(q_{\mathrm{jy}}-y\right)}^2}{2\,\sigma ^2}}";
isContained = contains(toBeChanged,toBeRemoved)
isContained = logical
   1
newString   = replace(toBeChanged, toBeRemoved,"{h(p,q_j)}")
newString = "\dot{h}_j(\phi_j,x,y) = \delta _{u}-\delta _{l}\,{h(p,q_j)}\,\phi_j"

ludolfusexe 2024-5-27

Wow, definitely needed a break, thank you!

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Answer 1

Chunru 2024-5-27

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2122931-replacing-substring-not-working#answer_1463831

在 MATLAB Online 中打开

toBeChanged = "\dot{h}_j(\phi_j,x,y) = \delta _{u}-\delta _{l}\,{\mathrm{e}}^{-\frac{{\left(q_{\mathrm{jx}}-x\right)}^2+{\left(q_{\mathrm{jy}}-y\right)}^2}{2\,\sigma ^2}}\,\phi_j";
%                                                                                           |                                  |                                                          
toBeRemoved =                                                  "{\mathrm{e}}^{-\frac{{\left(p_{\mathrm{jx}}-x\right)}^2+{\left(p_{\mathrm{jy}}-y\right)}^2}{2\,\sigma ^2}}";
s1 = extractAfter(toBeChanged, "\delta _{l}\,");
n = strlength(toBeRemoved);
s1 = char(s1);   s2 = char(toBeRemoved);
i1 = int16(s1(1:n)); i2 = int16(s2)
i2 = 1x106
   123    92   109    97   116   104   114   109   123   101   125   125    94   123    45    92   102   114    97    99   123   123    92   108   101   102   116    40   112    95
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
idx = find(i1 ~= i2)
idx = 1x2
    29    64
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
s1(idx)
ans = 'qq'
s2(idx)
ans = 'pp'
isContained = contains(toBeChanged,toBeRemoved)
isContained = logical
   0
toBeChanged = "\dot{h}_j(\phi_j,x,y) = \delta _{u}-\delta _{l}\,{\mathrm{e}}^{-\frac{{\left(q_{\mathrm{jx}}-x\right)}^2+{\left(q_{\mathrm{jy}}-y\right)}^2}{2\,\sigma ^2}}\,\phi_j"
toBeChanged = "\dot{h}_j(\phi_j,x,y) = \delta _{u}-\delta _{l}\,{\mathrm{e}}^{-\frac{{\left(q_{\mathrm{jx}}-x\right)}^2+{\left(q_{\mathrm{jy}}-y\right)}^2}{2\,\sigma ^2}}\,\phi_j"
toBeRemoved =                                                  "{\mathrm{e}}^{-\frac{{\left(q_{\mathrm{jx}}-x\right)}^2+{\left(q_{\mathrm{jy}}-y\right)}^2}{2\,\sigma ^2}}"
toBeRemoved = "{\mathrm{e}}^{-\frac{{\left(q_{\mathrm{jx}}-x\right)}^2+{\left(q_{\mathrm{jy}}-y\right)}^2}{2\,\sigma ^2}}"
isContained = contains(toBeChanged,toBeRemoved)
isContained = logical
   1
newString   = replace(toBeChanged, toBeRemoved,"{h(p,q_j)}")
newString = "\dot{h}_j(\phi_j,x,y) = \delta _{u}-\delta _{l}\,{h(p,q_j)}\,\phi_j"