# User Portlet

Discussions |
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Thank you for your answer. But, the Cases function permit to select all the XMLElements with the desired tag but the hierarchical structure (or tree) of the XMLElements is lost. |

Perfectly clear. Thank you |

I try this code to delete all the attributes of my XMLElements XMLtest = Block[{XMLElement}, XMLElement[tag_, _, content_] := XMLElement[tag, {}, content]; XMLtest] but it doesn't work, I receive this error message ... |

I simply my last question. Thank you in advance for your help My question was : **May you help me to modify this code in order I can add several conditions on the XMLElements that I want to keep in my XMLObjects. ? I need to keep now too types of... |

Hello, I would like to better understand the block function. First, is it a recursive function ? I have read the help but I didn't well understand the operation of this function. Here a an example where a Block function is used and that I... |

Thank you You perfectly answer to my question. |

Hello, I have a matrix M[3,3]. After a solve procedure, I obtained these results. {{M[1, 2] -> Cos[?[t]], M[1, 3] -> 0, M[2, 3] -> 0, Cos[?[t]] -> M[3, 1], M[3, 2] -> 0, M[3, 3] -> 1, M[2, 1] -> -Cos[?[t]] Sin[?[t]], M[2, 2] -> Sin[?[t]],... |

Here my code, to help for troubleshouting Equation Psi eq? = (A*cos[?[t]]^2 - C*cos[?[t]]^2 + C)*[???][t] + (-2*A*sin[?[t]]*cos[?[t]] + 2*C*sin[?[t]]*cos[?[t]])* Derivative[1][?][t]* Derivative[1][?][t] + ... |

OK. Thank you. But I would like to reproduce exactly the cells (for Mathematica inputs) I have in Mathematica. |

Hello, Thank you for your help. First, concerning the substraction of two equations, I found on the net on more simple way (to my point of view) : `Inner[Subtract, eq\[Psi]Ae, eq\[Psi]E, Equal];` Secondly, I have still a little... |