File with a NaN (wavelet)

I have data every 10 minutes. The software I'm using (to generate the wavelet) does not accept lack of data in some time (the software does not run with NaN). Would you have any suggestions without having to share the data file?

Note: Time step must be constant. This is required by the software. Software: Cross wavelet and wavelet coherence

Example:

34.3167  10.2950  
34.3208  NaN  
34.3250  8.3275  
34.3292  7.9050  
34.3333  6.1225  
34.3375  NaN  
34.3417  2.7800  
34.3458  1.0475  
34.3500  -0.2650  
34.3542  -1.4075  
34.3583  -2.5825  
34.3625  -3.5925  
34.3667  NaN  
34.3708  NaN  
34.3750  NaN  
34.3792  NaN  
34.3833  NaN  
34.3875  NaN  
34.3917  -6.7925  
34.3958  -6.8100  
34.4000  -6.3875  
34.4042  NaN 
34.4083  -5.7900  
34.4125  -5.5300  
34.4167  -5.4625  
34.4208  -5.6075  
34.4250  -5.7350  
34.4292  -5.8350  
34.4333  NaN 
34.4375  -5.8050  
34.4417  -5.7425  
34.4458  -5.2750  
34.4500  -3.9725  
34.4542  NaN

Thanks in advance

[Star Strider]

What MATLAB functions are you using?

[student]

I am using a cross wavelet and wavelet coherence toolbox for MATLAB. http://www.glaciology.net/wavelet-coherence

Answer 1

[James Tursa]

To replace NaN values with 0's in a variable X:

X(isnan(X)) = 0;