How to plot from txt file using textscan?

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

[Walter Roberson]

Which information do you need to extract from the table?

What data do you get out of the file if you use

filename = 'NameOfFileGoesHere.txt';
opt = detectImportOptions(filename);
data = readtable(filename, opt);

[MG]

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

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

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]

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

[MG]

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};

Answer 1

[Paul]

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.