Math Text

MatPlotLibNet supports LaTeX-like inline math in any label, title, or annotation. Wrap expressions in $...$.

Greek letters and super/subscript

Plt.Create()
    .WithTitle(@"$\alpha$ decay and $\beta$ noise — $\omega = 0.4$ rad/ms")
    .AddSubPlot(1, 2, 1, ax => ax
        .WithTitle(@"R$^{2}$ = 0.97")
        .SetXLabel(@"$\Delta t$ (ms)")
        .SetYLabel(@"$\sigma$ (normalised)")
        .Plot(t, decay, line => { line.Label = @"$\alpha$ decay"; })
        .WithLegend(LegendPosition.UpperRight))
    .AddSubPlot(1, 2, 2, ax => ax
        .WithTitle(@"Noise — $\mu \pm 2\sigma$")
        .SetXLabel(@"$\Delta t$ (ms)")
        .SetYLabel(@"Amplitude ($\times 10^{-3}$)")
        .Plot(t, noise, line => { line.Label = @"$\beta$ noise"; })
        .WithLegend(LegendPosition.UpperRight))
    .TightLayout()
    .Save("math_text.svg");

Fractions, square roots, accents, font variants (v1.3.0)

Plt.Create()
    .WithTitle(@"MathText — $\frac{d}{dx}\sqrt{x^2+1}$ and $\hat{\alpha} \cdot \vec{F}$")
    .AddSubPlot(1, 2, 1, ax => ax
        .WithTitle(@"$\mathbf{y} = \frac{\mathrm{sin}(x)}{e^{x/10}}$")
        .SetXLabel(@"$\Delta t$ (s)")
        .SetYLabel(@"$\hat{y}$ (normalised)")
        .Plot(x, y1, s => { s.Label = @"$\mathrm{sin}$"; })
        .Plot(x, y2, s => { s.Label = @"$\mathrm{cos}$"; })
        .WithLegend(LegendPosition.UpperRight))
    .AddSubPlot(1, 2, 2, ax => ax
        .WithTitle(@"$\sqrt{x^2 + y^2} \leq \mathbb{R}$")
        .SetXLabel(@"$x \in \mathbb{R}$")
        .SetYLabel(@"$\bar{y} \pm \sigma$")
        .Plot(x, y1, s => { s.Label = @"$\vec{v}$"; })
        .WithLegend(LegendPosition.UpperRight))
    .TightLayout()
    .Save("math_text_v130.svg");

Operator limits — integrals, sums, products (v1.7.0)

Sub/superscripts on large operators render as limits (above/below):

Plt.Create()
    .WithTitle(@"$\sum_{i=0}^{n} \frac{1}{i!} = e$ — Taylor expansion")
    .AddSubPlot(1, 1, 1, ax => ax
        .SetXLabel(@"$\int_a^b f(x)\,dx$")
        .SetYLabel(@"$\prod_{k=1}^{N} (1 + r_k)$")
        .Plot(x, y, s => s.Label = @"$e^{-\lambda t}$")
        .WithLegend())
    .Save("operator_limits.svg");

Supported large operators

LaTeX	Renders	Example
\int_a^b	∫ with limits above/below	$\int_0^{\infty} e^{-x}\,dx$
\iint	∬	$\iint_D f\,dA$
\iiint	∭	$\iiint_V f\,dV$
\oint	∮	$\oint_C \vec{F} \cdot d\vec{r}$
\sum_{i=0}^{n}	Σ with limits	$\sum_{i=1}^{n} x_i$
\prod_{k=1}^{N}	Π with limits	$\prod_{k=1}^{N} a_k$
\lim_{x \to 0}	lim with subscript below	$\lim_{n \to \infty} a_n$
\max, \min	max/min with subscript	$\max_{x \in S} f(x)$

Matrices (v1.7.0)

Plt.Create()
    .WithTitle(@"$\begin{pmatrix} a & b \\ c & d \end{pmatrix} \cdot \vec{x} = \vec{b}$")
    .AddSubPlot(1, 1, 1, ax => ax
        .SetXLabel(@"$\begin{bmatrix} 1 & 0 \\ 0 & 1 \end{bmatrix}$")
        .Plot(x, y))
    .Save("matrix_labels.svg");

Supported matrix environments

Environment	Delimiters	Example
matrix	None	$\begin{matrix} a & b \\ c & d \end{matrix}$
pmatrix	Parentheses ( )	$\begin{pmatrix} 1 & 2 \\ 3 & 4 \end{pmatrix}$
bmatrix	Brackets [ ]	$\begin{bmatrix} x \\ y \\ z \end{bmatrix}$
vmatrix	Vertical bars			$\begin{vmatrix} a & b \\ c & d \end{vmatrix}$

Cells separated by &, rows separated by \\.

Supported features

Feature	Syntax	Example
Greek letters	$\alpha$, $\Omega$	α, Ω
Superscript	$x^{2}$	x²
Subscript	$x_{i}$	xᵢ
Fractions	$\frac{a}{b}$	a/b stacked
Square root	$\sqrt{x}$, $\sqrt[n]{x}$	√x, ⁿ√x
Accents	$\hat{x}$, $\bar{x}$, $\vec{F}$, $\tilde{x}$, $\dot{x}$	x̂, x̄, F⃗
Font variants	$\mathrm{text}$, $\mathbf{F}$, $\mathit{x}$, $\mathcal{L}$, $\mathbb{R}$	roman, bold, italic, script, blackboard
Text mode	$\text{label}$	roman text inside math
Spacing	$a\,b$, $a\quad b$	thin space, em space
Delimiters	$\left(\frac{a}{b}\right)$	scaled brackets
Math operators	$\pm$, $\times$, $\leq$, $\infty$, $\rightarrow$	±, ×, ≤, ∞, →
Large operators	$\sum_{i}^{n}$, $\int_a^b$, $\prod$	Σ, ∫, Π with limits
Matrices	$\begin{pmatrix}...\end{pmatrix}$	Grid with delimiters

Using math in annotations

Plt.Create()
    .AddSubPlot(1, 1, 1, ax => ax
        .Plot(x, y)
        .Annotate(@"$\frac{\partial f}{\partial x} = 0$ (critical point)", 5, 3.2, ann =>
        {
            ann.ArrowTargetX = 5;
            ann.ArrowTargetY = y[5];
            ann.ArrowStyle = ArrowStyle.FancyArrow;
        }))
    .Save("math_annotation.svg");