How to plot from txt file using textscan?

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MG 2020-10-11

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https://ww2.mathworks.cn/matlabcentral/answers/610811-how-to-plot-from-txt-file-using-textscan

评论： MG 2020-10-11

XFOIL Version 6.99

Calculated polar for: NACA 2408

1 1 Reynolds number fixed Mach number fixed

xtrf = 1.000 (top) 1.000 (bottom)

Mach = 0.000 Re = 9.000 e 6 Ncrit = 9.000

alpha CL CD CDp CM Top_Xtr Bot_Xtr

------ -------- --------- --------- -------- -------- --------

0.000 0.2388 0.00480 0.00041 -0.0529 0.4528 0.2191

1.000 0.3512 0.00477 0.00048 -0.0532 0.3796 0.3528

2.000 0.4613 0.00494 0.00072 -0.0533 0.2523 0.5660

4.000 0.6729 0.00562 0.00159 -0.0513 0.0456 0.9816

5.000 0.7881 0.00625 0.00207 -0.0524 0.0199 1.0000

6.000 0.8975 0.00690 0.00262 -0.0521 0.0110 1.0000

7.000 1.0060 0.00760 0.00326 -0.0518 0.0076 1.0000

8.000 1.1129 0.00842 0.00404 -0.0513 0.0053 1.0000

9.000 1.2181 0.00931 0.00492 -0.0506 0.0044 1.0000

11.000 1.4217 0.01152 0.00716 -0.0484 0.0032 1.0000

12.000 1.5182 0.01294 0.00863 -0.0467 0.0027 1.0000

13.000 1.6086 0.01477 0.01056 -0.0441 0.0022 1.0000

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MG 2020-10-11

I need to plot alpha vs CL, CL vs CD etc.

I am getting this following

Var1 Var2 Var3 Var4 Var5 Var6 Var7 Var8 Var9 Var10 Var11

____ ______ _______ _______ _______ ______ ______ ____ _______ _____ _____

NaN NaN 1 NaN 1 NaN NaN NaN '' '' NaN

NaN NaN 0 NaN NaN 9 NaN 6 'Ncrit' '=' 9

NaN NaN NaN NaN NaN NaN NaN NaN '' '' NaN

0 0.2388 0.0048 0.00041 -0.0529 0.4528 0.2191 NaN '' '' NaN

1 0.3512 0.00477 0.00048 -0.0532 0.3796 0.3528 NaN '' '' NaN

2 0.4613 0.00494 0.00072 -0.0533 0.2523 0.566 NaN '' '' NaN

4 0.6729 0.00562 0.00159 -0.0513 0.0456 0.9816 NaN '' '' NaN

5 0.7881 0.00625 0.00207 -0.0524 0.0199 1 NaN '' '' NaN

6 0.8975 0.0069 0.00262 -0.0521 0.011 1 NaN '' '' NaN

7 1.006 0.0076 0.00326 -0.0518 0.0076 1 NaN '' '' NaN

8 1.1129 0.00842 0.00404 -0.0513 0.0053 1 NaN '' '' NaN

9 1.2181 0.00931 0.00492 -0.0506 0.0044 1 NaN '' '' NaN

11 1.4217 0.01152 0.00716 -0.0484 0.0032 1 NaN '' '' NaN

12 1.5182 0.01294 0.00863 -0.0467 0.0027 1 NaN '' '' NaN

13 1.6086 0.01477 0.01056 -0.0441 0.0022 1 NaN '' '' NaN

Walter Roberson 2020-10-11

You could probably add a 'HeaderLines' option to the detectImportOptions. I think it might be 'HeaderLines', 9

MG 2020-10-11

在 MATLAB Online 中打开

Thanks! it works

filename = 'Save_Polar.txt';
opt = detectImportOptions(filename);
data = readtable(filename, opt);
D=data(6:end,1:5);
Alpha  =D{:,1};
CL     =D{:,2};
CD     =D{:,3};
CDp    =D{:,4};
CM     =D{:,5};

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Answer 1

Paul 2020-10-11

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https://ww2.mathworks.cn/matlabcentral/answers/610811-how-to-plot-from-txt-file-using-textscan#answer_510961

I’ve been having a lot of success lately in these types of problems by using extractFileText to read it all into a string, and then using a few manipulations to get to the data. Works well if you have a well-defined file format.