This paper presents an efficient 88 line MATLAB

code for topology optimization. It has been developed using

the 99 line code presented by Sigmund (2001) as a starting

point. The original code has been extended by a density

filter, and a considerable improvement in efficiency has been

achieved, mainly by preallocating arrays and vectorizing

loops. A speed improvement with a factor of 100 is achieved

for a benchmark example with 7500 elements. Moreover,

the length of the code has been reduced to a mere 88 lines.

These improvements have been accomplished without

sacrificing the readability of the code. The 88 line code

can therefore be considered as a valuable successor to the

99 line code, providing a practical instrument that may

help to ease the learning curve for those entering the field

of topology optimization.