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Last Updated: September 09, 2019
·
2.868K
· synth # An algorithm to generate fake but realistic looking graph data(that trends too)

###### graphs

The syntax highlighter here sucks, so you may want to read the code here: http://pastie.org/8494639

You can drop the code into a ruby terminal and it will output a string that you can copy/paste into google charts playground here: https://code.google.com/apis/ajax/playground/?type=visualization#line_chart

``````# In order to generate a semi-realistic looking graph behavior
# we use a sine function to generate periodic behavior(ups and downs).  In order to avoid
# a graph that is too regular, we introduce randomness at two levels:
# The delta between steps across the x-axis is random, but within a range(deltavariance)
# The wavelength of the sine function is varied by randomly incrementing the index we pass
# to the sine function(sine_index)

# CONFIGURATION VARIABLES
yvalue = 1 # start value
range = 100 # y-range
deltavariance = 10 # allowable variance between changes
sine_index, wavelength = 0, 0.33 #index into our sine function that determines whether we change direction or not
i, maxi = 0, 100 # our counter and its maximum
data = {sine_index => yvalue} # seed our data structure with its first value
trend = :positive # :negative, :none # do we want the graph to trend upwards, downwards or neither
periodmin, periodmax = 0, 0 # vars to enforce trending
direction = 1 # start in a positive direction, -1 for negative

# DO NOT EDIT BELOW THIS LINE
while(i < maxi)

olddirection = direction
direction = Math.sin(sine_index).to_f
direction = direction < 0 ? direction.floor : direction.ceil

delta = rand(deltavariance)
yvalue += delta * direction

if trend == :positive
yvalue = periodmin if yvalue < periodmin
periodmin = yvalue if olddirection < direction
elsif trend == :negative
yvalue = periodmax if yvalue > periodmax
periodmax = yvalue if olddirection > direction

end

data[sine_index] = yvalue
sine_index += Math.sin(rand) # Math.sin(rand) will give random numbers from -1..1
i += 1
end

code = <<-CODE
function drawVisualization() {
// Create and populate the data table.
var data = google.visualization.arrayToDataTable([
['x', 'Cats'],
DATASTR
]);

// Create and draw the visualization.
draw(data, {curveType: "function",
width: 500, height: 400,
vAxis: {maxValue: 10}}
);
}
CODE

datastr = data.collect{|k,v|  "[#{k},#{v}]"}.join(",")
code = code.gsub('DATASTR', datastr)
puts code``````

#### 2 Responses

11061 Is the first comment spam?.. They are really everywhere

over 1 year ago ·
11062 yes, spam. i got my hopes up.

over 1 year ago ·