iphone - Core plot majorIntervalLength : unable to make it work -


am trying plot simple graph (cannot tough! have used core plot before!). have dates plotted in x-axis. , small float values in y-axis, 0.139503, 0.139481, etc. have plot 5 such values (which fetch backend). y-axis range, finding lowest of these values , setting start of y-axis range. , setting majorintervallength (highestvalue - lowestvalue)/5, (for example) 0.007946. y-axis interval seems fixed @ interval of 1. so, since y-axis values small (difference between them in order of 0.01), plots being drawn @ y=0.0. here's code snippet :

-(void) initializegraph {       if ((self.graph == nil) || (self.graph == null)) {          self.graphhostview = [(cptgraphhostingview *) [cptgraphhostingview alloc] initwithframe:self.view.bounds];          self.graph = [[cptxygraph alloc] initwithframe:self.graphhostview.bounds];     graph.paddingleft   = 2.0;     graph.paddingright  = 2.0;     graph.paddingtop    = 2.0;     graph.paddingbottom = 2.0;     graph.title = @"graph plot";      // plotting style set line plots     cptmutablelinestyle *linestyle = [cptmutablelinestyle linestyle];     linestyle.linecolor = [cptcolor blackcolor];     linestyle.linewidth = 2.0f;      cptxyaxisset *axisset = (cptxyaxisset *) self.graph.axisset;     axisset.xaxis.majorticklinestyle = linestyle;     axisset.xaxis.majorticklength = 7.0f;     axisset.xaxis.labelingpolicy = cptaxislabelingpolicyequaldivisions;     axisset.yaxis.labelingpolicy = cptaxislabelingpolicyequaldivisions;     axisset.xaxis.labelrotation = 90.0;     cptxyplotspace *plotspace = (cptxyplotspace *) self.graph.defaultplotspace;     // determine lowest , highest values plotted in y axis)     cgfloat ylow = 0.1;     cgfloat yhigh = ylow;     (int i=0 ; i<self.dict.count ; i++) {         mycustomobject *mydata = (mycustomobject *) [dict objectforkey:                                                            [self.arraykeys objectatindex:i]];          if (mydata.mem < ylow) {             ylow = mydata.mem;         }         if (yhigh < mydata.mem) {             yhigh = mydata.mem;         }     }     plotspace.xrange = [cptplotrange plotrangewithlocation:cptdecimalfromfloat(0)                                                   length:cptdecimalfromfloat(5)];     plotspace.yrange = [cptplotrange plotrangewithlocation:cptdecimalfromfloat(ylow)                                                     length:cptdecimalfromfloat(5)];      // determine point graph starts     //axisset.yaxis.orthogonalcoordinatedecimal = cptdecimalfromfloat(ylow);     axisset.yaxis.majorintervallength = cptdecimalfromcgfloat((yhigh-ylow)/5.0);     nslog(@"y axis interval : %f", (yhigh-ylow)/5.0);     ... }  -(nsnumber *) numberforplot:(cptplot *)plot                   field:(nsuinteger)fieldenum             recordindex:(nsuinteger)index {     if ( fieldenum == cptscatterplotfieldy ) {         return [nsnumber numberwithfloat:mydata.mem];     } else {         return [nsnumber numberwithint:index];     } }

why majorintervallength y axis setting not working?

are setting axisset.yaxis.majorticklength anywhere? don't see in code above.

if majorticklength nil nothing show tick's.


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