Mastering Contour Graphs for Data Visualization
Contour graphs, also known as contour plots, are visual representations of three-dimensional (3D) surfaces in two dimensions (2D). They are useful for depicting functions of two variables, showing regions of constant value. These graphs use lines, called contour lines or isolines, to connect points of equal value on the surface. Applications span diverse fields like geography (topographic maps), meteorology (weather maps showing isobars), and engineering (design optimization). Understanding contour graphs enhances data interpretation and analysis across various disciplines.
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// Use a data frame (2D-array) for the graph
var data = [
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// ... (data truncated after 29 records for clarity)
]
// Create the configuration for the graph
var config = {
"graphType" : "Heatmap",
"heatmapCellBox" : false,
"showContourLevel" : true,
"showSampleNames" : false,
"showVariableNames" : false,
"subtitle" : "datasets - volcano",
"title" : "Topographic Information on Auckland's Maunga Whau Volcano",
"xAxis" : ["V1","V2","V3","V4","V5","V6","V7","V8","V9","V10","V11","V12","V13","V14","V15","V16","V17","V18","V19","V20","V21","V22","V23","V24","V25","V26","V27","V28","V29","V30","V31","V32","V33","V34","V35","V36","V37","V38","V39","V40","V41","V42","V43","V44","V45","V46","V47","V48","V49","V50","V51","V52","V53","V54","V55","V56","V57","V58","V59","V60","V61"]
}
// Event used to create graph (optional)
var events = false
// Call the CanvasXpress function to create the graph
var cX = new CanvasXpress("canvasId", data, config, events);
// Functions after rendering graph
cX.createContour();
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],
"smps" : ["Smp1","Smp2","Smp3","Smp4","Smp5","Smp6","Smp7","Smp8","Smp9","Smp10","Smp11","Smp12","Smp13","Smp14","Smp15","Smp16","Smp17","Smp18","Smp19","Smp20","Smp21","Smp22","Smp23","Smp24","Smp25","Smp26","Smp27","Smp28","Smp29","Smp30","Smp31","Smp32","Smp33","Smp34","Smp35","Smp36","Smp37","Smp38","Smp39","Smp40","Smp41","Smp42","Smp43","Smp44","Smp45","Smp46","Smp47","Smp48","Smp49","Smp50","Smp51","Smp52","Smp53","Smp54","Smp55","Smp56","Smp57","Smp58","Smp59","Smp60","Smp61","Smp62","Smp63","Smp64","Smp65","Smp66","Smp67","Smp68","Smp69","Smp70","Smp71","Smp72","Smp73","Smp74","Smp75","Smp76","Smp77","Smp78","Smp79","Smp80","Smp81","Smp82","Smp83","Smp84","Smp85","Smp86","Smp87"],
"vars" : ["V1","V2","V3","V4","V5","V6","V7","V8","V9","V10","V11","V12","V13","V14","V15","V16","V17","V18","V19","V20","V21","V22","V23","V24","V25","V26","V27","V28","V29","V30","V31","V32","V33","V34","V35","V36","V37","V38","V39","V40","V41","V42","V43","V44","V45","V46","V47","V48","V49","V50","V51","V52","V53","V54","V55","V56","V57","V58","V59","V60","V61"]
}
}
// Create the configuration for the graph
var config = {
"graphType" : "Heatmap",
"heatmapCellBox" : false,
"showContourLevel" : true,
"showSampleNames" : false,
"showVariableNames" : false,
"subtitle" : "datasets - volcano",
"title" : "Topographic Information on Auckland's Maunga Whau Volcano",
"xAxis" : ["V1","V2","V3","V4","V5","V6","V7","V8","V9","V10","V11","V12","V13","V14","V15","V16","V17","V18","V19","V20","V21","V22","V23","V24","V25","V26","V27","V28","V29","V30","V31","V32","V33","V34","V35","V36","V37","V38","V39","V40","V41","V42","V43","V44","V45","V46","V47","V48","V49","V50","V51","V52","V53","V54","V55","V56","V57","V58","V59","V60","V61"]
}
// Event used to create graph (optional)
var events = false
// Call the CanvasXpress function to create the graph
var cX = new CanvasXpress("canvasId", data, config, events);
// Functions after rendering graph
cX.createContour();
</script>
</body>
</html>
library(canvasXpress)
y=read.table("https://www.canvasxpress.org/data/r/cX-volcano-dat.txt", header=TRUE, sep="\t", quote="", row.names=1, fill=TRUE, check.names=FALSE, stringsAsFactors=FALSE)
canvasXpress(
data=y,
graphType="Heatmap",
heatmapCellBox=FALSE,
showContourLevel=TRUE,
showSampleNames=FALSE,
showVariableNames=FALSE,
subtitle="datasets - volcano",
title="Topographic Information on Auckland's Maunga Whau Volcano",
xAxis=list("V1", "V2", "V3", "V4", "V5", "V6", "V7", "V8", "V9", "V10", "V11", "V12", "V13", "V14", "V15", "V16", "V17", "V18", "V19", "V20", "V21", "V22", "V23", "V24", "V25", "V26", "V27", "V28", "V29", "V30", "V31", "V32", "V33", "V34", "V35", "V36", "V37", "V38", "V39", "V40", "V41", "V42", "V43", "V44", "V45", "V46", "V47", "V48", "V49", "V50", "V51", "V52", "V53", "V54", "V55", "V56", "V57", "V58", "V59", "V60", "V61"),
afterRender=list(list("createContour"))
)
