LaTeX型別的text物件。比如xlabel("{a_k}");顯示ak，k為下標。matlab畫圖中特殊字元和下標有表示，下劃線上標用^(指數)下標用_(下劃線)希臘字母等特殊字元用\加拼音如α\alphaβ\betaγ\gammaθ\thetaΘ\ThetaГ\Gammaδ\deltaΔ\Deltaξ\xiΞ\Xiη\eltaε\epsilongζ\zetaμ\miuυ\nuτ\tauλ\lamdaΛ\Lamdaπ\piΠ\Piσ\sigmaΣ\Sigmaφ\phiΦ\Phiψ\psiΨ\Psiχ\chiω\ommigaΩ\Ommiga<\leq>\geq不等於\neq<<\ll>>\gg正負\pm左箭頭\leftarrow右箭頭\rightarrow上箭頭\uparrow例text(2,3,"\alpha_2^\beta")注：可用{}把須放在一起的括起來若要使標題或註釋中顯示含有下劃線的字元，如：d_Comparedalgorithm，則有：title("d\_Comparedalgorithm");legend("d\_Comparedalgorithm");