docs: better handling of html only for formulas.

3 files changed, 18 insertions, 6 deletions

diff --git a/gnuradio-core/src/lib/filter/gr_iir_filter_ffd.h b/gnuradio-core/src/lib/filter/gr_iir_filter_ffd.h
index ba0c78486..84be57768 100644
--- a/gnuradio-core/src/lib/filter/gr_iir_filter_ffd.h
+++ b/gnuradio-core/src/lib/filter/gr_iir_filter_ffd.h
@@ -43,18 +43,22 @@ gr_make_iir_filter_ffd (const std::vector<double> &fftaps,
  *
  * 
  * The input and output satisfy a difference equation of the form
- \f{html}{
+ \htmlonly
+ \f{
  y[n] - \sum_{k=1}^{M} a_k y[n-k] = \sum_{k=0}^{N} b_k x[n-k]
  \f}
+ \endhtmlonly
 
  \xmlonly
  y[n] - \sum_{k=1}^{M} a_k y[n-k] = \sum_{k=0}^{N} b_k x[n-k]
  \endxmlonly
 
  * with the corresponding rational system function
- \f{html}{
+ \htmlonly
+ \f{
  H(z) = \ frac{\sum_{k=0}^{M} b_k z^{-k}}{1 - \sum_{k=1}^{N} a_k z^{-k}}
  \f}
+ \endhtmlonly
 
  \xmlonly
  H(z) = \ frac{\sum_{k=0}^{M} b_k z^{-k}}{1 - \sum_{k=1}^{N} a_k z^{-k}}
diff --git a/gnuradio-core/src/lib/filter/gr_single_pole_iir_filter_cc.h b/gnuradio-core/src/lib/filter/gr_single_pole_iir_filter_cc.h
index c330c2140..78fa25393 100644
--- a/gnuradio-core/src/lib/filter/gr_single_pole_iir_filter_cc.h
+++ b/gnuradio-core/src/lib/filter/gr_single_pole_iir_filter_cc.h
@@ -40,18 +40,22 @@ gr_make_single_pole_iir_filter_cc (double alpha, unsigned int vlen=1);
  * \ingroup filter_blk
  *
  * The input and output satisfy a difference equation of the form
- \f{html}{
+ \htmlonly
+ \f{
  y[n] - (1-alpha) y[n-1] = alpha x[n]
  \f}
+ \endhtmlonly
 
  \xmlonly
  y[n] - (1-alpha) y[n-1] = alpha x[n]
  \endxmlonly
 
  * with the corresponding rational system function
- \f{html}{
+ \htmlonly
+ \f{
  H(z) = \frac{alpha}{1 - (1-alpha) z^{-1}}
  \f}
+ \endhtmlonly
 
  \xmlonly
  H(z) = \ frac{alpha}{1 - (1-alpha) z^{-1}}
diff --git a/gnuradio-core/src/lib/filter/gr_single_pole_iir_filter_ff.h b/gnuradio-core/src/lib/filter/gr_single_pole_iir_filter_ff.h
index ee6a554bf..d2bae5c26 100644
--- a/gnuradio-core/src/lib/filter/gr_single_pole_iir_filter_ff.h
+++ b/gnuradio-core/src/lib/filter/gr_single_pole_iir_filter_ff.h
@@ -39,18 +39,22 @@ gr_make_single_pole_iir_filter_ff (double alpha, unsigned int vlen=1);
  * \ingroup filter_blk
  *
  * The input and output satisfy a difference equation of the form
- \f{html}{
+ \htmlonly
+ \f{
  y[n] - (1-alpha) y[n-1] = alpha x[n]
  \f}
+ \endhtmlonly
 
  \xmlonly
  y[n] - (1-alpha) y[n-1] = alpha x[n]
  \endxmlonly
 
  * with the corresponding rational system function
- \f{html}{
+ \htmlonly
+ \f{
  H(z) = \frac{alpha}{1 - (1-alpha) z^{-1}}
  \f}
+ \endhtmlonly
 
  \xmlonly
 H(z) = \ frac{alpha}{1 - (1-alpha) z^{-1}}