hello can you please help I'm getting this errorIndex in position 2 exceeds array bounds (must not exceed 1). Error in BetaNewmark_MDOF (line 21) xd(:,i+1)=​xd(:,i)+(1​-b)*dt*x

Answer 1

[darova]

You are trying to access allements that don't exist. Try this

% xdd(:,i), xdd(:,i+1)      % WRONG
xdd(i), xdd(i+1)            % GOOD

Answer 2

[Walter Roberson]

you only assign to a single column of xdd but you try to access up to column that is one more than the number of times you have