下面是Matlab官方列出来的Tex代码列表，包含了绝大部分的希腊字母和数学符号。
这个比较清楚
| Character Sequence | Symbol | Character Sequence | Symbol | Character Sequence | Symbol |
|---|---|---|---|---|---|
| alpha | α | upsilon | υ | sim | ~ |
| beta | β | phi | Φ | leq | ≤ |
| gamma | γ | chi | χ | infty | ∞ |
| delta | δ | psi | ψ | clubsuit | ? |
| epsilon | ? | omega | ω | diamondsuit | ? |
| zeta | ζ | Gamma | Γ | heartsuit | ? |
| eta | η | Delta | Δ | spadesuit | ? |
| theta | Θ | Theta | Θ | leftrightarrow | ? |
| vartheta | ? | Lambda | Λ | leftarrow | ← |
| iota | ι | Xi | Ξ | uparrow | ↑ |
| kappa | κ | Pi | Π | rightarrow | → |
| lambda | λ | Sigma | Σ | downarrow | ↓ |
| mu | μ | Upsilon | ? | circ | o |
| nu | ν | Phi | Φ | pm | ± |
| xi | ξ | Psi | Ψ | geq | ≥ |
| pi | π | Omega | Ω | propto | ∝ |
| rho | ρ | forall | ? | partial | ? |
| sigma | σ | exists | ? | bullet | ? |
| varsigma | ? | ni | ? | div | ÷ |
| tau | τ | cong | ? | neq | ≠ |
| equiv | ≡ | approx | ≈ | aleph | ? |
| Im | ? | Re | ? | wp | ? |
| otimes | ? | oplus | ? | oslash | ? |
| cap | ∩ | cup | ∪ | supseteq | ? |
| supset | ? | subseteq | ? | subset | ? |
| int | ∫ | in | ∈ | o | ο |
| rfloor | ë | lceil | é | nabla | ? |
| lfloor | û | cdot | · | ldots | ... |
| perp | ⊥ | neg | ¬ | prime | ′ |
| wedge | ∧ | times | x |
| ? |
| rceil | ù | surd | √ | mid | | |
| vee | ∨ | varpi | ? | copyright | © |
| langle | ∠ | rangle | ∠ |
文档中的Text Properties:
下标用 _(下划线) 上标用^ （尖号） 斜体 it 黑体 bf；
比如在坐标轴的[0.5 0.5]位置上要显示δ字符，那么可以直接输入text(0.5,0.5,'delta')
如果需要显示大写希腊字符的话，那直接将首字母改为大写就可以了；
注意必须使用“”引导，如果需要显示“”，那么必须输入“\；
类似的在字符串组合的时候如果要输入“'”则必须如下输入“''”；
另外text字符可以重叠显示，这样就可以构造出一些有趣的效果，比如将某个字符上添加一个斜杠或者画一个叉等。
| Character Sequence | Symbol | Character Sequence | Symbol | Character Sequence | Symbol |
|---|---|---|---|---|---|
| alpha | α | upsilon | υ | sim | ~ |
| beta | β | phi | Φ | leq | ≤ |
| gamma | γ | chi | χ | infty | ∞ |
| delta | δ | psi | ψ | clubsuit | ♣ |
| epsilon | ɛ | omega | ω | diamondsuit | ♦ |
| zeta | ζ | Gamma | Γ | heartsuit | ♥ |
| eta | η | Delta | Δ | spadesuit | ♠ |
| theta | Θ | Theta | Θ | leftrightarrow | ↔ |
| vartheta | ϑ | Lambda | Λ | leftarrow | ← |
| iota | ι | Xi | Ξ | uparrow | ↑ |
| kappa | κ | Pi | Π | rightarrow | → |
| lambda | λ | Sigma | Σ | downarrow | ↓ |
| mu | μ | Upsilon | ϒ | circ | o |
| nu | ν | Phi | Φ | pm | ± |
| xi | ξ | Psi | Ψ | geq | ≥ |
| pi | π | Omega | Ω | propto | ∝ |
| rho | ρ | forall | ∀ | partial | ∂ |
| sigma | σ | exists | ∃ | bullet | • |
| varsigma | ς | ni | ∍ | div | ÷ |
| tau | τ | cong | ≅ | neq | ≠ |
| equiv | ≡ | approx | ≈ | aleph | ℵ |
| Im | ℑ | Re | ℜ | wp | ℘ |
| otimes | ⊗ | oplus | ? | oslash | ∅ |
| cap | ∩ | cup | ∪ | supseteq | ⊇ |
| supset | ⊃ | subseteq | ⊆ | subset | ⊂ |
| int | ∫ | in | ∈ | o | ο |
| rfloor | ë | lceil | é | nabla | ∇ |
| lfloor | û | cdot | · | ldots | ... |
| perp | ⊥ | neg | ¬ | prime | ′ |
| wedge | ∧ | times | x |
| ∅ |
| rceil | ù | surd | √ | mid | | |
| vee | ∨ | varpi | ϖ | copyright | © |
| langle | ∠ | rangle |
参考：http://blog.sciencenet.cn/blog-81613-842684.html
