CODEWITHSUNDEEP
javascriptd3.js
user3259040
user3259040

Reputation: 155

Calculate the domain of data

I am reading a list of files filestoplot.txt and load them to an array (datasets[fileno]). These 2-D arrays are similar in structure, and I wanted to calculate the max and min of each column (of all combined arrays) so that I can correctly establish the global d3 axis. However, my code (shown below ) does not correctly return gloablmax and gloablmin. 

var files=[];
var datasets=[],totalfiles;
var i,j,dset=1,olddset=0,maxscale=0;
var maxnecr=0;
var cols=8;
var maxvalues=[];
var globalmin=[];gloablmax=[];

//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
function loadfilenames(){

d3.csv("./filestoplot.txt", 
function(file){
    files = file.map(function(d) { for (key in d) { fn=d[key]; } return fn; })
    totalfiles=files.length;
    for (i=0;i<totalfiles;i++){ 
        datasets[i]=[]; 
        loaddataset(i);
        maxvalues[i]=[];
    }
    if (filesloaded==(totalfiles-1)) maxmin();
}
);
}
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
function loaddataset(fileno){
d3.csv(files[fileno],function(a){
    console.log("loading file "+filesloaded);filesloaded++;
    datasets[fileno]=a.map(function(d1) {
    return [
    +d1["f1"] ,
    +d1["f2"] ,
    +d1["f3"] ,
    +d1["f4"] ,
    +d1["f5"] ,
    +d1["f6"] ,
    +d1["f3"]/(+d1["f3"] + +d1["f5"]),
    +d1["f7"]
    ];
}
);
}
);
}
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
function maxmin(){
for (j=0; j <cols; j++) {
    globalmin[j]=Math.Min.apply(null,d3.extent(maxvalues,function(d){ return d[j][0]; }))
    gloablmax[j]=Math.Max.apply(null,d3.extent(maxvalues,function(d){ return d[j][1]; }))
    //d3.extent(maxvalues,function(d){ console.log(d[j]);});
}
}

//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

</script>

<body style="max-width:90%" onload="loadfilenames();">
<script>

function changedataset(el){
    console.log(el.checked)
    maxmin();
}
</script>
</body>

On the chrome console, I can see that maxvalues has the right data, however maxmin shows this error:

"Uncaught TypeError: Cannot read property 'apply' of undefined"

I would be greatful for any pointers. Thanks.

Upvotes: 0

Views: 38

Answers (1)

Adam Stone
Adam Stone

Reputation: 2006

Apply is only used twice,

Math.Min.apply
Math.Max.apply

If apply is a 'property of undefined', it means Math.Min and/or Math.Max is undefined.

It looks like you just have a capitalization problem, try Math.min and Math.max (of course there may be other problems as well, but that should be the source of the TypeError).

Upvotes: 2

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