 
 (With a prefix, C-u \\[ynb-update-all] and C-u \\[ynb-tex-update-all] will update the cells 
 without prompting)
-Since the Yacas output can be returned to the Yacas-Notebook buffer, by default
-the buffer which runs the Yacas process is not shown.  This can be changed.
- \\[ynb-show-yacas-buffer] show the Yacas buffer
- C-u \\[ynb-show-yacas-buffer] don't show the Yacas buffer.
 Single lines can be evaluated:
  \\[ynb-replace-line] replace the current line with Yacas output
  \\[ynb-replace-line-with-tex] replace the current line with Yacas output 

      (error "Not in Yacas cell"))
  (save-excursion
    (ynb-delete-output)
    (ynb-get-output tex)
    ))

(defun ynb-update-type-cell (tex)
  "Send input to Yacas and replace output with result.

(defconst ynb-menu-process
  (list
    "Process"
    ["Start a Yacas process"   yacas-start
     (not (processp yacas-process))]
    ["Run Yacas on region"  yacas-region]
    ["Run Yacas on initialization cells"  ynb-eval-init]
    ["Send string to Yacas" yacas-eval-string t]
    ["Reset the Yacas process" yacas-reset t]
    ["Kill Yacas process"  yacas-stop (processp yacas-process)]))

(defun ynb-info-help ()
  (interactive)
