to find mode shape 1 data, i converted my previous data into frf data/ graph containing frequancy (Hz) and phase( degress).

M represents absolute values of mode. To find out which M data is postive and which M data is negative, phase is needed. if phase is positive for corresponding data, then mode is postive. if phase is negative, then mode is negative. my question is: how can i write a code down that without changing M values, M valuses becomes positive or negative depending on in P is postive or negative?

110 Amode shapes R-1: mode shape 1 111 112 113- 114 - 115 116 117 118 - 119 120 121 122 123 124 125 126 122 >> P 1.7057 -0.7433 -0.7496 -0.6042 -1.0041 -0.6920 2.6353 2.6350 1.8989 -0.5911 fa