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here are my IIR coefficients:

CoefIIR=[1.630078934734 1.267893338385 1.112390120011]

and here are the result given to me by matlab commands:

CoefIIR =

1.6301    1.2679    1.1124

How can I keep the precision for data storage and during calculations?

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    $\begingroup$ The precision is kept. It is just the display values. Type format long to change the displayed precision. $\endgroup$ – GKH Feb 17 at 8:56
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    $\begingroup$ you are right. I cannot unfortunately make your answer as the right one $\endgroup$ – Yaakov Feb 17 at 10:14
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    $\begingroup$ It's ok, no worries. I am glad I helped. $\endgroup$ – GKH Feb 17 at 10:57
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    $\begingroup$ @GKH: please copy your comment into an answer, below -- it certainly is a good answer, and should be recognized as such. $\endgroup$ – TimWescott Feb 17 at 15:38
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The precision is kept. It is just the display values that are truncated.

Type format long to change the displayed precision.

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