LaTeX code in radio bullets

[VivaldoMendes]

Hi,

I am developing a multiple-question assessment. I have a problem: LaTeX code does not render in a radio bullet. Please see the attached image.

Does anyone know how I can overcome this problem?

Thanks.

[isheng-eqi]

LaTeX rendering in marimo's mo.ui.radio options depends on how you pass the options. Here are the approaches that work:

Solution 1: Use raw strings (most common fix)

Python string escaping can break LaTeX. Use raw strings:

import marimo as mo

options = {
    r"$x^2 + y^2 = r^2$": "circle",
    r"$\frac{a}{b}$": "fraction",
    r"$\int_0^\infty e^{-x} dx$": "integral"
}

radio = mo.ui.radio(options=options, label="Choose:")

The r prefix prevents Python from interpreting \f, \i, etc. as escape sequences.

Solution 2: Use mo.md() for explicit Markdown rendering

If raw strings don't work, explicitly render each option as Markdown:

import marimo as mo

options = {
    mo.md(r"$x^2 + y^2 = r^2$"): "circle",
    mo.md(r"$\frac{a}{b}$"): "fraction",
}

radio = mo.ui.radio(options=options)

Solution 3: Define options as a list (if order matters)

radio = mo.ui.radio(
    options=[
        r"$x^2 + y^2 = r^2$",
        r"$\frac{a}{b}$",
        r"$\int_0^\infty e^{-x} dx$"
    ],
    label="Choose an equation:"
)

With list format, the displayed label and the value are the same string, so LaTeX rendering must happen in the display layer. This works if marimo's frontend renders $...$ in radio labels automatically.

If none of these work

Check your marimo version:

pip show marimo

LaTeX in UI elements improved in recent versions. Upgrade if needed:

pip install --upgrade marimo

Also verify that LaTeX works in other marimo elements (try mo.md(r"$E=mc^2$") in a cell). If it does not, the issue is with your marimo installation, not specifically with radio buttons.