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Questions - curve

Why does the larger of two curves have the lower integrated value using trapz from numpy?

Using trapz from numpy I get the following: lewis_result_outer = np.trapz(lewis_few_elements_outer_y, x=lewis_few_elements_outer_x) lewis_result_inner = np.trapz(lewis_few_elements_inner_y, x=lewis_fe...
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EDRM

python

numpy

curve

integral

Votes: 0

Answers: 1

Latest Answer

Incidental, but you can trivially verify that trapz(y, x) is just (0.5 * (y[1:] + y[:-1]) * (x[1:] - x[:-1])).sum() As it turns out, the issue is one of scaling and span. Your chart shows the segment...
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Mad Physicist

How to detect a curve in a B&W image with a background grid?

I am struggling to extract the curve from this image: It represents scientific data which I don't want to touch, to avoid introducing errors, so I cannot just manually redraw the line in a plot digit...
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jumpjack

javascript

image

charts

detection

curve

Votes: 0

Answers: 1

Latest Answer

After several experiments (based on these examples) and tests, I ended up with this code: let src = cv.imread('canvasInput'); let dst = new cv.Mat(); let M = cv.Mat.ones(3, 3, cv.CV_8U); let anchor = ...
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jumpjack

Finding difference within grouped dataframe in python

I have this dataframe: Value ID Timestamp ----------------------------------------- 2018-07-03 02:19:28 45 111 2018-07-03 02:19:29 36 ...
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LostinSpatialAnalysis

python

pandas

dataframe

subset

curve

Votes: 0

Answers: 1

Latest Answer

Use GroupBy.transform here for apply solution per groups to new column: def f(x): #for debug print (x) slopes = x.diff().bfill() #for debug print (slopes) signs = slopes > 0...
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jezrael

How to apply Photoshop-style color curves filters to an HTML tag?

I'm trying to replicate the following Photoshop color curves filter in an HTML video tag. The closest answer I've found so far is how to add Photoshop-like color levels with CSS and SVG Filters but i...
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Diego Sanchez

html

css

colors

curve

svg-filters

Votes: 0

Answers: 1

Latest Answer

feComponentTransfer / table is how you implement color curves. This filter will - roughly - produce that curve combo and should give you a place to start. The first feComponentTransfer implements the ...
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Michael Mullany

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