How to get specific rows in a text file and store it in a matrix?

Hello everyone, I have a text file of consisting data. I want to pick up specific rows starting with (PL51) and store it in a matrix.

+Any kind of help would be appreciated.

+Data sample

+ Also, you can find text file in the attachment.

*  2021  5 16  0  0  0.00000000
PL51   3237.654801  -2943.534852  11471.056095 999999.999999
VL51 -50540.516761 -31697.794702   6392.165187 999999.999999
*  2021  5 16  0  2  0.00000000
PL51   2623.316843  -3313.921643  11529.952432 999999.999999
VL51 -51818.375773 -30014.173455   3421.719481 999999.999999
*  2021  5 16  0  4  0.00000000
PL51   1994.763046  -3663.432262  11553.143593 999999.999999
VL51 -52908.945184 -28219.874309    442.832755 999999.999999
*  2021  5 16  0  6  0.00000000
PL51   1354.271051  -3990.791260  11540.583352 999999.999999
VL51 -53807.318501 -26323.742841  -2535.319935 999999.999999
*  2021  5 16  0  8  0.00000000
PL51    704.172979  -4294.831581  11492.335440 999999.999999
VL51 -54509.324800 -24334.991911  -5503.591803 999999.999999
*  2021  5 16  0 10  0.00000000
PL51     46.846515  -4574.498718  11408.573045 999999.999999
VL51 -55011.543908 -22263.160221  -8452.890926 999999.999999
*  2021  5 16  0 12  0.00000000
PL51   -615.294186  -4828.854373  11289.578001 999999.999999
VL51 -55311.318759 -20118.070018 -11374.206387 999999.999999
*  2021  5 16  0 14  0.00000000
PL51  -1279.807708  -5057.079602  11135.739656 999999.999999
VL51 -55406.764955 -17909.784089 -14258.633917 999999.999999

Answer 1

[Sulaymon Eshkabilov]

Here is a quick solution:

%% Set up the Import Options and import the data
opts = delimitedTextImportOptions("NumVariables", 7);

% Specify range and delimiter
opts.DataLines = [3, Inf];
opts.Delimiter = " ";

% Specify column names and types
opts.VariableNames = ["VarName1", "VarName2", "VarName3", "VarName4", "VarName5", "VarName6", "VarName7"];
opts.VariableTypes = ["categorical", "double", "double", "double", "double", "double", "double"];

% Specify file level properties
opts.ExtraColumnsRule = "ignore";
opts.EmptyLineRule = "read";
opts.ConsecutiveDelimitersRule = "join";
opts.LeadingDelimitersRule = "ignore";

% Specify variable properties
opts = setvaropts(opts, "VarName1", "EmptyFieldRule", "auto");

% Import the data
lageos1 = readtable("lageos1.txt", opts);
% Select and separate data
D=lageos1;
DS = D((lageos1(:,1).VarName1=='PL51'),:);  % Selected data

[Sulaymon Eshkabilov]

Most Welcome Mohammad!

Answer 2

[dpb]

One of about a zillion ways...deliberately illustrating some newer features...

opt=detectImportOptions('lageos1.txt','CommentStyle',{'*'},'FileType','fixedwidth');
opt.SelectedVariableNames=opt.SelectedVariableNames(2:end);
data=readmatrix('lageos1.txt',opt);
data=data(1:2:end,:);