Replacing substring not working

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.

[Mathieu NOE]

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]

Wow, definitely needed a break, thank you!

Answer 1

[Chunru]

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

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idx = find(i1 ~= i2)

idx = 1x2

29 64

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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"