How do I count how many NaN's in a data cell?

I was given a csv file by my teacher to download and i read it using this code below:

clear;

fclose all;

fileID = fopen('accidents_2017.csv');

text1 = textscan(fileID,'%s%s%s%s%s%s%d%d%s%d%d%d%d%f%f','HeaderLines',1,'Delimiter',{','},'EmptyValue',NaN);

fclose(fileID);

I tried using the function isnan(text1) but it tells me "Undefined function 'isnan' for input arguments of type 'cell'. " Is there a different function I should be using>

Answer 1

[Walter Roberson]

nnz(isnan(text1{7})

[Sarah Mullin]

Will this only work for columns that are numerical values? I tried converting column 1(which are strings) to numbers with str2double(text1{1}) and it worked. then when i do nnzisnan(text1{1}) it gives me the error of "Undefined function 'isnan' for input arguments of type 'cell'."