How to label each equation in align environment

Question

I wonder how to label each equation in align environment  For example   begin align   label eq lnnonspbb   lambda i    mu i   0     mu i  xi i   0     lambda i  y i  w T x i   b  - 1    xi i    0  end align     only label the first equation and only the first equation can be referred later

User · Answer

like this   begin align    x   rm L   amp    L  int  cos theta left  xi right  d xi    label eq 1        y   rm L   amp    L  int  sin theta left  xi right  d xi    nonumber   end align

User · Answer

Usually my align environments are set up like   begin align      label eqn1     lambda i    mu i   0       label eqn2     mu i  xi i   0       label eqn3     lambda i  y i  w T x i   b  - 1    xi i    0  end align     The  label command should be placed in the line you want to reference  the placement in the line does not matter  I prefer to place it at the beginning at the line  as a sort of description  while others place them at the end

User · Answer

You can label each line separately  in your case    begin align     lambda i    mu i   0  label eq 1       mu i  xi i   0  label eq 2       lambda i  y i  w T x i   b  - 1    xi i    0  label eq 3   end align     Note that this only works for AMS environments that are designed for multiple equations  as opposed to multiline single equations

User · Answer

Within the environment align from the package amsmath it is possible to combine the use of  label and  tag for each equation or line  For example  the code   documentclass article   usepackage amsmath    begin document  Write  begin align  x y label eq eq1  tag Aa    x z label eq eq2  tag Bb    y-z label eq eq3  tag Cc    y-2z nonumber  end align  then cite  eqref eq eq1  and  eqref eq eq2  or  eqref eq eq3  separately   end document   produces

User · Answer

tag also works in align   Example    begin align     a x   2   amp   bx tag 1       a x   2   amp   b tag 2       ax  amp   b tag 3       a x   2  bx  amp   c tag 4       a x   2  c  amp   bx tag 5       a x   2   amp   bx c tag 6          Where quad a  b  c     in N  end align     Output

User · Answer

The answers seem a bit dated  they don t work for me  What did work was    begin align  1 1 2      tag xyz   end align    reference

[latex] How to label each equation in align environment?

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