scaled image of plot

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George Valdes 2015-5-20

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编辑： Thorsten 2015-5-20

I've created a very large image of a time series data set [~300,000 x 75] pixels. Below that image I would like to create and append a time series signal component (an x,y-type plot) in the form of an image with time axis labels. Is it possible to create a figure to this exact same scale (the dataset is the same dimension), then convert it into an image that I may combine similarly to [img1;img2]?

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Answer 1

Thorsten 2015-5-20

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I think the result would look awkward, (300000 x 75 is quite an extreme format). But you can do it: 1. plot the graph, 2. save the figure using print -dpng, 3. read the png file, 4. resize it using imresize and finally 5. concatenate the two images [img1; img2].

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George Valdes 2015-5-20

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The awkwardly plotted image is actually quite captivating for this data type. the alternative is having to break the data into roughly 270 separate images vs. a single scrolling png. Its just that the software limitations on figure dimensions make it a little difficult to work around. mathworks could solve this application with just a scrollbar.

 when plotting the data as you've recommended it compresses the data to fit on screen so the signal information is lost when saving the image. Is there a coded version of figure generation that doesn't compress the data, similar in function to the imwrite() method that I use for the full scale images?

Thorsten 2015-5-20

编辑：Thorsten 2015-5-20

I do not know of such a function. But you could do your plot my allocating a large matrix of ones and then setting for each x the corresponding y value in the matrix to 0. Of course you have to map the range of y to some the choosen height of the matrix.

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