If you want only the Mondays to show up, you'll need to set the type of the 
first column to 'string' not 'date'.  Type 'date' produces a continuous 
axis (a timeline, in this case), so the displayed axis values need not line 
up with specific data points; type 'string' produces a discrete axis where 
every point has it's own axis label.  You could, using a string type, 
simply set each value to the month instead of a date (ie, 'January', 
'February', 'March', etc).

I should also point out that you don't have any valid options in your 
options array; see the list of available options here: 
http://code.google.com/apis/chart/interactive/docs/gallery/linechart.html#Configuration_Options
 

On Tuesday, February 28, 2012 12:52:27 PM UTC-5, gaëlle fernandez wrote:
>
> Hi everybody! 
> (first of all, excuse my bad english, i'm a beginner) 
>
> i want to draw a linechart of percent by dates (percent in y and dates 
> in x axis) 
> i want to symbolize each week of a current month by just display each 
> monday of each week. 
> (all of these mondays are stocked into a array called mondays[].) 
>
> so, my chart will have just 4 or 5 visible dates on the x-axis. 
>
> i tried to work with the chxr parameter by changing it in the options 
> here is how i set my columns : 
>
> var chartTimeLine = new google.visualization.DataTable(); 
> chartTimeLine.addColumn('date', 'Temps'); 
> chartTimeLine.addColumn('number','Fréquence'); 
>  for (var j=0;j<mesFreq.length;j++){ 
>         chartTimeLine.addRows([ 
>                [mondays[j],mesFreq[j]] 
>          ]) 
> } 
>
> var myOptions = { 
> axis_index:0, 
> start_val:mondays[0], 
> end_val:mondays[mondays.length-1], 
> opt_step:mondays.length/2 
> } 
>
> var chartLine = new google.visualization.LineChart(myDiv); 
> chartLine.draw(chartTimeLine, myOptions); 
>
> so, my result shows me a chart with several dates of my current month 
> and not just the four mondays i would like to display. 
>
> Do you have any idea on what is the problem and how i can fix it, 
> please? 
>
> (and i don't want to use an annotated time line) 
>
> Thanks! 
>

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