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Unknown variable complex equation

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Karl Zammit
Karl Zammit on 15 Apr 2021 at 16:19
Commented: Star Strider on 19 Apr 2021 at 12:09
I know all of the values of the equation shown apart from M. How do I go about finding it?
Cp = -6521
gamma = 1.4

Accepted Answer

Star Strider
Star Strider on 15 Apr 2021 at 17:18
I ahve no idea what ‘Cp’ does here.
Otherwise:
gamma = 1.4;
prat = @(Me,gamma) ((1+(gamma-1)/2.*Me.^2).^(gamma/(gamma-1))) ./ (2*gamma/(gamma+1).*Me.^2 - (gamma-1)/(gamma+1));
Me = fsolve(@(Me)prat(Me,gamma), 10);
produces:
Me =
1.4832
.
  10 Comments
Star Strider
Star Strider on 19 Apr 2021 at 12:09
It would appear that Walter Roberson got there first. I will add an Answer if Walter’s does not do what you want.
The problem with your original code to read that file is that it did not account for every column. Consider using this textscan call instead:
dataBuffer = textscan(finputCdCl, repmat('%f',1,7), 'CollectOutput', 1, ... %Read data from file
'Delimiter', '', 'HeaderLines', 12);
I did not test that with that file, however it would likely do what you want. If it does, and if the readtable approach does not work the way you want it to, I will add this as an Answer. Also, if you want to save the columns as separate cell arrays, set 'CollectOutput' to 0. Check to be certain that the 'Delimiter' is correct, since it could be '\t'.

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