??? Undefined function or variable 'latm'.

Error in ==> <a href="error:D:\OCEANUS_2010\OCEANUS\Scientific_analysis\programs\flux\AUTOflux_eval_OCEANUS_2010.m,97,0">AUTOflux_eval_OCEANUS_2010 at 97</a>
    latd=nanmean(latm);