can anyone help me to determine the sampling frequency ??if data is sampled at 100 hz ?

Here is the data of accelerometer. where the first column represents the time and 2nd 3rd and 4rth x, y ,z respectively.

1360805138  -0.685866  -4.001562  0.722538
1360805138  -0.560495  -2.429519  1.915072
1360805138  -0.174554  -1.559088  2.408179
1360805138  0.1325  -1.628509  1.698921
1360805138  0.294765  -1.737373  0.404076
1360805138  0.393192  -1.495007  -0.50859
1360805138  0.382755  -1.256403  -1.093691
1360805138  0.201678  -1.168777  -1.209838
1360805138  0.032252  -1.132975  -0.977666
1360805138  0.094148  -1.138193  -0.563447
1360805138  0.175948  -1.156277  -0.188429
1360805138  0.194032  -1.151301  0.165836
1360805138  0.173278  -1.091711  0.438301
1360805138  0.172914  -0.971923  0.535878
1360805138  0.12546  -0.861238  0.5502
1360805138  0.065506  -0.740723  0.481871
1360805138  0.045845  -0.664869  0.441335
1360805138  0.045845  -0.664869  0.441335
1360805138  0.04099  -0.266549  0.160132
1360805138  0.04099  -0.266549  0.160132
1360805138  0.04099  -0.266549  0.160132
1360805138  0.04099  -0.266549  0.160132
1360805138  -0.025032  0.133471  -0.504464
1360805138  0.072181  0.359088  -0.469025
1360805138  0.164904  0.597571  -0.450942
1360805138  0.25702  0.82331  -0.318654
1360805138  0.262482  0.920524  -0.177384
1360805138  0.274011  0.919188  -0.17168
1360805138  0.331781  0.85705  -0.594395
1360805138  0.301319  0.476206  -1.652942
1360805138  -0.041295  0.097061  -1.862661
1360805138  -0.331601  -0.342281  -1.80392
1360805138  -0.066661  -0.099915  -1.118207
1360805138  0.539558  -1.187953  -1.35317
1360805138  0.767846  -2.890342  -2.118499
1360805138  1.182672  -3.301527  -0.309187
1360805138  0.233597  -4.001562  2.337908
1360805138  0.173521  -2.871652  2.819242
1360805138  -0.230382  -1.996002  2.982114
1360805138  -0.59909  -1.96287  1.777323
1360805138  -0.634892  -1.960685  1.08457
1360805138  -0.61511  -1.904008  0.534543
1360805138  -0.61511  -1.904008  0.534543
1360805138  -0.61511  -1.904008  0.534543
1360805138  -0.61511  -1.904008  0.534543
1360805138  -0.61511  -1.904008  0.534543
1360805138  -0.61511  -1.904008  0.534543
1360805138  -0.181229  -1.181035  0.178458
1360805138  -0.181229  -1.181035  0.178458
1360805138  -0.370802  -0.996318  0.420217
1360805138  -0.391434  -0.842912  0.484056
1360805138  -0.345679  -0.696667  0.430655
1360805138  -0.318615  -0.563651  0.347034
1360805138  -0.297133  -0.370923  0.283196
1360805138  -0.318372  -0.205624  0.238898
1360805138  -0.343373  -0.04263  0.15103
1360805138  -0.285725  0.132257  0.004299
1360805138  -0.176617  0.23299  -0.303726
1360805138  -0.200769  0.235175  -0.645247
1360805138  -0.13414  0.386396  -0.703988
1360805138  -0.163631  0.693449  -0.6393
1360805138  -0.160233  1.040675  -0.363437
1360805138  -0.110231  1.251729  -0.195953
1360805138  -0.084137  1.15136  -0.136849
1360805138  -0.08171  0.88108  -0.378851
1360805138  -0.244339  0.614441  -0.76285
1360805138  -0.244339  0.614441  -0.76285
1360805138  0.160778  -0.085594  -2.441573
1360805138  0.126795  -0.247009  -2.31596
1360805138  0.126795  -0.247009  -2.31596
1360805138  0.126795  -0.247009  -2.31596
1360805139  -0.322013  -2.919713  0.367545
1360805139  -0.171035  -4.001562  1.821499
1360805139  -0.534402  -3.527873  2.090566
1360805139  -0.684773  -2.579283  2.990246
1360805139  -0.649213  -1.782764  3.302154
1360805139  -0.358422  -1.840534  2.605518
1360805139  -0.009134  -2.068943  0.589643
1360805139  0.099003  -1.887502  -0.067064
1360805139  0.204469  -1.484205  -0.808119
1360805139  0.129951  -1.308226  -1.045267
1360805139  0.062229  -1.258709  -0.988832
1360805139  -0.022726  -1.194264  -0.734329
1360805139  0.025213  -1.209799  -0.202022
1360805139  0.053612  -1.16987  0.124815
1360805139  0.100945  -1.038917  0.394367
1360805139  0.182988  -0.897526  0.432961
1360805139  0.212965  -0.763297  0.424829
1360805139  0.19743  -0.653947  0.38308
1360805139  0.188085  -0.52894  0.310261
1360805139  0.167331  -0.376384  0.235985
1360805139  0.167331  -0.376384  0.235985
1360805139  0.141966  -0.177224  0.090226
1360805139  0.061258  -0.063991  0.026873
1360805139  0.061258  -0.063991  0.026873
1360805139  0.061258  -0.063991  0.026873
1360805139  0.061258  -0.063991  0.026873
1360805139  0.061258  -0.063991  0.026873
1360805139  0.061258  -0.063991  0.026873
1360805139  0.067205  0.936301  -0.397541
1360805139  0.081405  1.004023  -0.247776
1360805139  0.179589  0.821611  -0.526795
1360805139  0.350836  0.677065  -1.237509
1360805139  0.25253  0.280565  -1.801736
1360805139  -0.352597  -0.279656  -1.739354
1360805139  -0.1555  -0.187176  -1.325863
1360805139  -0.023819  -0.074913  -0.730081
1360805139  0.534461  -1.680574  -1.511552
1360805139  1.335228  -2.892041  -1.497837
1360805139  0.983391  -4.001562  2.408785
1360805139  0.359331  -4.001562  1.756569
1360805139  0.080191  -3.073725  2.897523
1360805139  -0.254048  -1.981196  3.382619
1360805139  -0.636955  -1.90425  2.309023
1360805139  -0.63113  -1.94952  0.896212
1360805139  -0.63113  -1.94952  0.896212
1360805139  -0.520688  -1.839441  -0.0525
1360805139  -0.057801  -1.324003  -0.732145
1360805139  0.151311  -1.189288  -0.844043
1360805139  0.1325  -1.161496  -0.710177
1360805139  -0.028309  -1.146568  -0.394992
1360805139  -0.150767  -1.11392  -0.11294
1360805139  -0.327717  -1.024596  0.211712
1360805139  -0.350412  -0.901896  0.385386
1360805139  -0.331843  -0.760141  0.430898
1360805139  -0.290215  -0.585011  0.439272
1360805139  -0.284511  -0.434276  0.403348
1360805139  -0.304536  -0.258296  0.376162
1360805139  -0.320678  -0.092511  0.313416
1360805139  -0.290458  0.069147  0.189988
1360805139  -0.227833  0.145243  0.098357
1360805139  -0.182322  0.214664  -0.141703
1360805139  -0.191424  0.224009  -0.466355
1360805139  -0.197614  0.468802  -0.699619
1360805139  -0.264486  0.720999  -0.588812
1360805139  -0.154165  1.225393  -0.344019
1360805139  -0.108532  1.312776  -0.327513
1360805139  -0.03996  0.92817  -0.616605
1360805139  -0.102342  0.775614  -0.784938
1360805139  -0.180258  0.485429  -1.503056
1360805139  -0.045786  0.335786  -1.921159
1360805139  -0.045786  0.335786  -1.921159
1360805139  -0.050762  -0.042873  -1.238844

here's the code am working on

clear
close all
%%Setting the harvester parameters:
m=10^(-3);%proof mass (m) in kg.
k=0.17;%Spring constant in kg.s^2
b=0.0055;%Spring damping factor kg/s
% the proof mass displacement limit Zl is setted in the simulink file to be 0.01 meter

%%Reading the accelerometer input file, 
%This file has 4 columns:
%the first one is the time, 
%the second, third and the fourth ones are the measured x-axial, y-axial and z-axial acceleration, respectively. 
%PLEASE SPECIFY THE PATH OF THE INPUT FILE IN THE COMMAND BELOW
Acc=xlsread('C:\MATLAB\HASC24273-acc.csv'); 

%%Plotting the input accelerometer signal
figure,plot(Acc(:,1),Acc(:,2))
hold on
plot(Acc(:,1),Acc(:,3),'r')
plot(Acc(:,1),Acc(:,4),'g')
hold off
legend ('X Axis', 'Y Axis', 'Z Axis')
title('\bf Accelerometer Measurements');xlabel('Time (s)');ylabel(' Acceleration (m/s.s)')

%%Claculating the overall magnitude of acceleration

a=sqrt(Acc(:,2).^2+Acc(:,3).^2+Acc(:,4).^2);

%%Filtring the gravity using a 3rd order Butterworth high-pass filter with a 0.1 Hz cutoff frequency
%applying the frequency domian on overal magnitude of acceleration
F=fft(a); 
% specifying a 3rd order Butterworth filter with a 0.1 Hz cutoof frequency
[num,den]=butter(3,0.1,'high'); 
[H,w]=freqz(num,den,length(a)); 
% applying the previously specified filter to the frequency transfomation of the overall acceleration
y=H.*F;
% applying the inverse frequency domain transformation and getting the real part
FilteredAcc=real(ifft(y));

%%preparing the simulink file input simin as a two column variable, the
%%first column is the time and the second column is the filtered
%%acceleration
simin=[Acc(:,1),FilteredAcc];

%%Calling the simulink file which includes the mass spring damping system
sim('PowerHarvester',(length(simin(:,1))/100));
% reading the output of the simulink file both time and power values
P=[simout.time,simout.data];
%plotting the power output in \mu watt 
figure,plot(simout.time,(simout.data*1000000))
title('\bf Estimated Harvested Power');xlabel('Time (s)');ylabel(' Power (\muW)')

now i want to use laplace transform function .. can any body help me in this.

[Robert]

Please format your code using the code button in the editor.

[naadiya khudabux]

okay