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why does matlab store variables in workspace in engineering notation?

7 次查看（过去 30 天）
Rajesh
Rajesh 2012-10-10
This is VERY annoying when you want to something simple like
simulationtime=max(y);
sim('model.mdl')
and you get an error: Invalid StopTime specified in the Configuration Parameters dialog for block diagram
because your simulation time is 6600
and matlab stores it in the workspace as 6.000e+03 !!!!!
Rajesh
  2 个评论
Rajesh
Rajesh 2012-10-10
i dont mean display. for display i know i can use format to change the way it displays on the command window.
i mean store: how it is seen as stored in the workspace. when you click on simulationtime in the workspace you see it as 6.5e+03

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采纳的回答

Rajesh
Rajesh 2012-10-10
try 6508.79?
anyway for now i got around it by doing this:
simulationtime= double(max(y));
i dont know why simulink needs time to be in double data type. but seems it is how it is!
  1 个评论
Maddila
Maddila 2012-12-7
but am not getting this,,,,i specified my variable value as double also,,,but not working outm,,,can you help me how to set stop time of simulation with incremmenting

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更多回答（2 个）

Daniel Shub
Daniel Shub 2012-10-10
It seems very odd that MATLAB would display 6600 as 6.000e+03. I am also not able to get MATLAB to display 6.000e+03 (maybe it is a Windows/Linux difference). That said, have you looked at format?
doc format
If you set the format to be long, maybe you will get what you want. Consider
format short
x = 60000.1
x =
6.0000e+04
versus
format long
x = 60000.1
x =
6.000010000000000e+04
Walter Roberson
Walter Roberson 2012-10-13
The workspace has its own format control.
MATLAB (and Simulink) do not store data in decimal notation (except for Symbolic Toolbox, and sometimes Fixed Point Toolbox): they use binary, and in particular IEEE 754 double precision (usually) or single precision. Any representation similar to 6.5e+03 is a result of converting the binary storage mechanisms to decimal notation.

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