create a dialog box
resp = demo_mdialog(fil)
The function demo_mdialog create a dialog box. It takes as argument a binary file. This file is built by a .sce file written like below. It shall contain the variables ‘titl’, the title a the dialog box, ‘namevar’, the name of the fields to fill, and ‘value’, the values written by default. After this, these three variables shall be saved in the binary file. The use of demo_mdialog shall be preceded by the execution of the .sce associated. The function demo_mdialog returns ‘resp’, the values chosen by the user.
`exec`_('SCI/demos/control/pid/pid_dial_4.sce');
[defv]=demo_mdialog('SCI/demos/control/pid/pid_dial_4.bin');
if defv==[] then `warning`_('Demo stops!');return;end