<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;">Dear sir:<BR>I am trying to use the "convolve" command in sac2000,but there is<BR>something wrong with it.<BR>I type these commands below:<BR>>r R1.sac R2.sac<BR>>convolve<BR>it produce the following error<BR>>remove this function: src/co/zmemad()<BR>I don't know why.Could you please help me solve this problem.<BR>Yours ,<BR>Chen Haopeng</td></tr></table><br>