How to pre-allocate a double for following script ?

How to pre-allocate a variable name 'syncat' data type:(double) ,for following script. Please help. I get error while assigning as <syncat = cell(100000,2);> All other methods, which is available online are failed.

clear
clc
tic
Mmin    = 4.5;
Mmax    = 6.5;
Delta_M = 0.01;

a       = 4.5;
b       = 1;

% Annual occurrence rate of earthquakes with M >= Mmin
Lambda = 10^(a-b*Mmin);

Tmax = 100000; % Duration of the simulated catalog (years)

time = 0;
count = 0;
f = waitbar(0,'Please wait...');

while time <= Tmax
    
    % First simulation (time of the next earthquake)
    % This is the inverse of the Exponential distribution
    iatime = expinv(rand(1,1),1/Lambda);
    time = time + iatime;
    
    count = count + 1;
    waitbar(time/Tmax,f,[num2str(round(time/Tmax*10*100)/10),' %'])
    
    % Second simulation (magnitude value)
    m = - log10(10^(-b*Mmin)-rand(1,1)*(10^(-b*Mmin)-10^(-b*Mmax)))/b; % CDF - Mmin and Mmax
    
    syncat(count,:) = [time m];
end
close(f)
%% Let's now see how the simulated earthquake catalog looks like

years = syncat(:,1);
magnitude = syncat(:,2);

[NISHANT SURESHBHAI TEJANI]

However, It does not help with reducing computing time! Any suggestion ?

Answer 1

[Torsten]

What about

syncat = zeros(100000,2)

?

[NISHANT SURESHBHAI TEJANI]

It's working.

Thanks.

I am learning MATLAB!

[NISHANT SURESHBHAI TEJANI]

However, It does not help with reducing computing time! Any suggestion ?

[Stephen23]

"However, It does not help with reducing computing time! Any suggestion ?"

Get rid of the WAITBAR.