How do I save the entire workspace through an ode function call?

2014 7 1
3 个回答
更新时间：2014 7 2
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I am working in command line mode --- with nodisplay, nojwm, nosplash, and no desktop mode
I would like to record how variables change during a call to ode45. I want the entire sequence rather than just the final values.
I see the save command but what is the format of the file produced?

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回答（3 个）

Jan
Jan 2014-7-1

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The format of the save command is explained in detail here:
doc save
The description is not clear: "record how variables change". Which variables? What does "during a call" exactly mean? Inside of before versus after?

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Walt
Walt 2014-7-1
Hello and thanks. I am calculating using ode45. There will many calls to a "integration" function. It is values of various variables here that I wish to capture. e.g. ode45 calls fff(.m) several times and the sparse matrix A is created (by fff) once during each call. I would like to capture the sequence of values A takes on.

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James Tursa
James Tursa 2014-7-1

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If A is not too large and you don't have too many iterations, you might consider just storing them in memory and then saving later. E.g., put the A iterations in a global cell array with each iteration being one of the cells. Ordinarily I might have suggested a 3D array to hold the results, but that is not going to work very well if A is sparse (data copying issues with each iteration).
Walt
Walt 2014-7-1

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Thanks again.
Making A "global" is a good idea; thanks. Is there a way to cause sparse A to be saved in a readable form in a file; Will I have to create the fprintf iteration to get this? or is there a system call.v currently A is approximately 5x5 with about 10 calls to fff(.m) A may have only 6 or 7 entries.

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Walt
Walt 2014-7-2
Is there a way to have the workspace saved (in easily readable format) in a file while a short run-time matlab main function executes.

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2014-7-1

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