Rounding after using dlmread: how to store exact values?

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rkepp12 2016-6-26

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https://ww2.mathworks.cn/matlabcentral/answers/292305-rounding-after-using-dlmread-how-to-store-exact-values

评论： Image Analyst 2016-6-26

In some code, I am using the command "dlmread" to get data from ASCII files. To test it, I displayed the matrix of the stored data. When I did this, I found that the data was rounded off to four decimal places in the display? However, most of the data points have more than four decimal places, and I need those numbers.

Does "dlmread" actually round the values? Or is this just a result of displaying the matrix?

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Stephen23 2016-6-26

编辑：Stephen23 2016-6-26

"I found that MATLAB has rounded off..."

MATLAB does not secretly decide to round values that are stored in its memory. Some operation may be causing this "rounding", or perhaps it is an artifact of displaying those values. In either case we would need to see your code, because otherwise we have to rely on using our crystal balls... and sadly they are just not very reliable.

"How can I stop MATLAB from doing this to values?"

We don't know until we can diagnose and identify what is happening. We can't diagnose without seeing the patient. Ergo, edit your question, click the paperclip button to upload both your code and enough data to run the code and see this effect. Also clearly explain how you view the data to observe this effect.

Image Analyst 2016-6-26

Exactly what does "the file says" mean? Did you write the array back out to disk with dlmwrite() and you're popping it open with wordpad or something???

Please attach your data file and m script file with the paper clip icon.

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