How does negative values occur in NIFTY?

in nifty case study i didnt understand how the -ve values came i.e nifty.values[1:]-nifty.values[:-1] ==>in this code -ve values are coming and i dont understand how they subtract each other

what i did
s=nifty.values[1:]
t=nifty.values[:-1]

s[0]-t[0]//-117.0034 s[0]-t[1]//0

i cant understand how did the subtraction happen

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here the task seems to measure the change with respect to the previous closing. Hence the negative values highlight a negative change or a drop in the closing of the current day from its previous. Hope this helps!

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