Linked Questions

1
vote
2answers
79 views

Equation of graph from graph [duplicate]

How would I go about finding the equation of the solid black line exponential/logarithm graph? The two data points are: (x,y) (9,-14) (20,-21)
2
votes
0answers
172 views

How to estimate time series from a plot? [duplicate]

Possible Duplicate: Recovering data points from an image Suppose you have a colored plot of several time series (say, from a paper), but not the raw data. How would you estimate the series, which ...
0
votes
0answers
69 views

Detection the coordinates of all points of a curve on an image file [duplicate]

I have a plot of a curve (the black curve without dashes) on an image file.jpg: http://s000.tinyupload.com/index.php?file_id=48857135704766357735 I'd like to detect the coordinates of all point of ...
1
vote
0answers
45 views

Recovering data from a plot [duplicate]

Suppose I have an image which I got from a screenshot \ [![enter image description here][1]][1] [1]: https://i.stack.imgur.com/0Iuj2.png \ Nothing else is there. Now I want my x-axis range (0,1) ...
50
votes
5answers
9k views

How can I extract data points from a black and white image?

Consider the following graph (source): Is there any way to extract the data points from this image in a semi-automatic way? I have seen, and tried the methods suggested in this question, but they did ...
24
votes
6answers
14k views

Problem with NonlinearModelFit

I'm having trouble with a non-linear fit: fit = NonlinearModelFit[data, y0 + A Sin[\[Pi] (x - xc)/w], {y0, xc, A, w}, x] where ...
35
votes
2answers
2k views

How to make a curve selectable from a scaned image and convert it to a list of coordinates

I have a scanned image (binary-ized): Is there any way to reduce one of these curved lines (full or dotted) to a series of its coordinates (e.g., sampling interval of 0.01 on x-axis)? I've read ...
13
votes
3answers
1k views

Rotate a grid, made up of lines, so that it aligns with the xy axes

While working on an answer for another problem I hit upon one of my own. I took the image given in that question and cleaned it up so that I could detect the grid lines: ...
14
votes
2answers
1k views

How to detect loops in a vector field?

Given a vector field and I'd like to detect if there are streamlines in closed patterns. For example, if the input is a vector field like this: ...
20
votes
1answer
3k views

Finding the area, algebraic curve and jaggedness of an arbitrary shape

I start with a photograph of a shape (physically made by the flow of a liquid into another), of which I can extract the border, manually or using Mathematica's feature detect feature : Using the ...
13
votes
2answers
478 views

Extracting data from analog screen photograph

I'm using an analog profilometer from the 1970s and need a way to digitize the data and the only way is through a photograph. I've searched but all I could find was how to extract data from computer ...
3
votes
3answers
3k views

How to do deconvolution in spectrum with some peaks?

For example, I have the next spectrum: I've seen the next question ["How to perform a multi-peak fitting?"][2] but not answer to my question. I want deconvolution the spectrum to obtain three peaks (...
4
votes
2answers
2k views

Best fit equation from a scanned image

I am trying to extract a curve from a scanned graph and find a best fit equation. For example, starting from: How could one find an equation starting from the image file ?
4
votes
2answers
418 views

How can I get the solubility value of nitrogen in water at 10 degrees Celsius with Mathematica?

How can I get the solubility value of nitrogen in water at 10 °C with Mathematica? The site engineering toolbox dot com gives graphs of such values, but I want the numerical value. Related thread on ...
3
votes
1answer
657 views

extract data from a graph image

How do I convert the following image graph into data (if possible into function)? I checked this answer and found that my problem is grid and plot have same color.

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