try vAxis: {minValue: 0 }
or in your case

var chart = new
google.visualization.ColumnChart(document.getElementById('chart_div'));
        chart.draw(data, {width: 800, height: 450, title: 'Blood
Pressure',
                          hAxis: {title: 'Date/Time', titleTextStyle:
{color: 'blue'}},
                          vAxis: {minValue: 0}
                         });
      }

On Jul 13, 1:35 pm, Steve St-Laurent <[email protected]> wrote:
> Thanks again, Viz. Now I need to learn how to code this. I tried various 
> combinations of:
>
> "var chart = new 
> google.visualization.ColumnChart(document.getElementById('chart_div'));
>         chart.draw(data, {width: 800, height: 450, title: 'Blood Pressure',
>                           hAxis: {title: 'Date/Time', titleTextStyle: {color: 
> 'blue'}}
>                           vAxis: {minValue: {'0'}}
>                          });
>       }
>
> . . . to no avail. Do you sniff JHS newbie?
>
> > This seems to be a problem with Safari and iOS browsers that we weren't 
> > aware of - we will see what we can do on our end.
> > In the meanwhile, for this specific problem, you might be able to work 
> > around it by specifying to the chart that the minimum value on the vertical 
> > axis would be 0. This can be done by setting the minValue property inside 
> > the vAxis object in the options (see 
> > here:http://code.google.com/apis/chart/interactive/docs/gallery/columnchar...).
> >  I hope that this helps to some extent.
>
> -------------
> Steve St-Laurent | <[email protected]>
> Vancouver, BC

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