Facing below problem while linking CoolProp with MATLAB

Question

NAVEED ULLAH 2021-12-24

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1616920-facing-below-problem-while-linking-coolprop-with-matlab

评论： Walter Roberson 2021-12-31

采纳的回答： Walter Roberson

pyversion

version: '2.7'

executable: 'C:\Users\Shehryar Ishaque\Anaconda2\python.EXE'

library: 'C:\Users\Shehryar Ishaque\Anaconda2\python27.dll'

home: 'C:\Users\Shehryar Ishaque\Anaconda2'

isloaded: 0

>> [v,e] = pyversion; system([e,' -m pip install --user -U CoolProp'])

'C:\Users\Shehryar' is not recognized as an internal or external command,

operable program or batch file.

ans =

1

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Answer 1

Walter Roberson 2021-12-27

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https://ww2.mathworks.cn/matlabcentral/answers/1616920-facing-below-problem-while-linking-coolprop-with-matlab#answer_862440

在 MATLAB Online 中打开

[v,e] = pyversion;
cmd = sprintf('"%s" -m pip install --user -U CoolProp', e);
system(cmd)

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NAVEED ULLAH 2021-12-31

can you please guide me to get py.Coolprop.Coolprop.HAPropsSI resolve the issue

Walter Roberson 2021-12-31

在 MATLAB Online 中打开

http://www.coolprop.org/apidoc/CoolProp.CoolProp.html documents CoolProp.CoolProp.HAPropsSI so once (recent enough) CoolProp is installed,

T = py.CoolProp.CoolProp.HAPropsSI('T', 'P', '101325', 'H', H, 'R', 1.0)

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Answer 2

Shanmukha Voggu 2021-12-27

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1616920-facing-below-problem-while-linking-coolprop-with-matlab#answer_862415

编辑：Shanmukha Voggu 2021-12-27

Hi naveed,

system(command) calls the operating system to execute the specified command.

If you want to run multiple commands, use && between consecutive commands for windows

Refer to documentation of system

Hope this helps!

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Walter Roberson 2021-12-27

在 MATLAB Online 中打开

[v,e] = pyversion;
array = [e,' -m pip install --user -U CoolProp']
array = '/usr/bin/python -m pip install --user -U CoolProp'
whos array
  Name       Size            Bytes  Class    Attributes

  array      1x49               98  char               
array
array = '/usr/bin/python -m pip install --user -U CoolProp'

This tells us that the result of [e,' -m pip install --user -U CoolProp'] is a character vector, as required by system() .

The problem is not in the fact that the character vector is constructed instead of being static. The constructed character vector is as valid for the purpose of system() as if the content of the constructed character vector had been hard-coded in a system() call.

The problem is that the executable name happens to have spaces in it, and Windows is treating those spaces as the end of the command to execute, with the parts after the space being treated as parameters or options to the call. The cure is to ensure that the path to the executable is quoted when it goes into system()

Shanmukha Voggu 2021-12-27