What Shall I need to add while calling file having numerical digits (e.g. -1,-2)?

% Calculation of PGA Values for Individual Earthquake 
load Histories/IND.X0kY-1k.CXY.sema;
PGA_EQ(1,1) = max(IND.X0kY-1k.CXY(:,1));

But it shows a different error.

>>>>>> "Unexpected MATLAB expression"

Answer 1

[Walter Roberson]

https://www.mathworks.com/help/matlab/ref/load.html#btm40vx-5

To create the variable name, load precedes any leading underscores or digits in filename with an X and replaces any other nonalphabetic characters with underscores

So IND.X0kY-1k.CXY.sema would result in the creation of variable named IND_X0kY_1k_CXY (file extension is removed)

Answer 2

[the cyclist]

You may want to try the functional form instead.

load('Histories/IND.X0kY-1k.CXY.sema');

Also, what variables are in your workspace after loading? You will not have a variable named IND.X0kY-1k.CXY (which it seems you are trying to use), because that is not a valid variable name.