Removed spaces from top-level directory names.

Spaces tend to cause annoyances in a Unix-style shell environment.
This change fixes that.

87_3-D_Plot/3dplot.bas

@@ -0,0 +1,17 @@
+1 PRINT TAB(32);"3D PLOT"
+2 PRINT TAB(15);"CREATIVE COMPUTING  MORRISTOWN, NEW JERSEY"
+3 PRINT:PRINT:PRINT
+5 DEF FNA(Z)=30*EXP(-Z*Z/100)
+100 PRINT
+110 FOR X=-30 TO 30 STEP 1.5
+120 L=0
+130 Y1=5*INT(SQR(900-X*X)/5)
+140 FOR Y=Y1 TO -Y1 STEP -5
+150 Z=INT(25+FNA(SQR(X*X+Y*Y))-.7*Y)
+160 IF Z<=L THEN 190
+170 L=Z
+180 PRINT TAB(Z);"*";
+190 NEXT Y
+200 PRINT
+210 NEXT X
+300 END