CODEWITHSUNDEEP
pythonlatexmathjaxgoogle-colaboratory
glS
glS

Reputation: 1299

LaTeX equations do not render in google Colaboratory when using IPython.display.Latex

In a regular jupyter notebook, running, for example, the following:

from IPython.display import display, Math, Latex
display(Math(r'F(k) = \int_{-\infty}^{\infty} f(x) e^{2\pi i k} dx'))

produces an equation rendered in LaTeX (via Mathjax).

Even though LaTeX works fine in markdown cells, LaTeX equations produced as above do not seem to render in Google Colaboratory. The same happens to the output of functions for example from qutip, which would normally render in latex (for example, qutip.basis(2, 0) would normally render in latex, but doesn't in Colaboratory).

Why does this happen? Is there a way to have this work?

Upvotes: 15

Views: 33035

Answers (7)

andreagalle
andreagalle

Reputation: 754

I found this Google Colab Notebook very useful. Here's an example:

\begin{align}
    \mathbf{a} \cdot \mathbf{b} = \sum_{i=1}^n a_i b_i.
\end{align}

Upvotes: 0

gianni
gianni

Reputation: 124

Can you copy and paste in colab from wikipedia? Just add $$ at the beginning and at the end of a multiline formula.

Yes you can

$$\mathbf J_{\mathbf F}(x_1, x_2, x_3) = \begin{bmatrix}
  \dfrac{\partial y_1}{\partial x_1} & \dfrac{\partial y_1}{\partial x_2} & \dfrac{\partial y_1}{\partial x_3} \\[1em]
  \dfrac{\partial y_2}{\partial x_1} & \dfrac{\partial y_2}{\partial x_2} & \dfrac{\partial y_2}{\partial x_3} \\[1em]
  \dfrac{\partial y_3}{\partial x_1} & \dfrac{\partial y_3}{\partial x_2} & \dfrac{\partial y_3}{\partial x_3} \\[1em]
  \dfrac{\partial y_4}{\partial x_1} & \dfrac{\partial y_4}{\partial x_2} & \dfrac{\partial y_4}{\partial x_3} \end{bmatrix}
= \begin{bmatrix}
  1 & 0 & 0 \\
  0 & 0 & 5 \\
  0 & 8 x_2 & -2 \\
  x_3\cos x_1 & 0 & \sin x_1 \end{bmatrix}.$$

Upvotes: 0

Atsushi Sakai
Atsushi Sakai

Reputation: 309

Update (April / 2021):

It's possible to write formulas in Colab just putting them between $ symbols, with no need to import libraries:

$F(k) = \int_{-\infty}^{\infty} f(x) e^{2\pi i k} dx$

Old answer

As an alternative, the following description should work on text cell on Colab.

\begin{equation}

F(k) = \int_{-\infty}^{\infty} f(x) e^{2\pi i k} dx

\end{equation}

Upvotes: 10

Thom Ives
Thom Ives

Reputation: 3989

Use handcalcs

I hope you guys appreciate this route as much as I do. Came to me partially thru a post from a connection on LinkedIn.

In a first cell in a colab notebook:

%pip install handcalcs

In a new cell,

import handcalcs.render

Now, in another cell, let's do a simple test,

%%render
a = 23
b = 43
c = 2
d = 3.226

f = d / a + b

The output will be LaTeX code:

\[
\begin{aligned}
a &= 23 \;\textit{    }\\[10pt]
b &= 43 \;\textit{    }\\[10pt]
c &= 2 \;\textit{    }\\[10pt]
d &= 3.226 \;\textit{    }\\[10pt]
f &= \frac{ d }{ a } + b = \frac{ 3.226 }{ 23 } + 43 &= 43.14 \;\textit{    }
\end{aligned}
\]

Copy the part inside the []'s into a text cell,

\begin{aligned}
a &= 23 \;\textit{    }\\[10pt]
b &= 43 \;\textit{    }\\[10pt]
c &= 2 \;\textit{    }\\[10pt]
d &= 3.226 \;\textit{    }\\[10pt]
f &= \frac{ d }{ a } + b = \frac{ 3.226 }{ 23 } + 43 &= 43.14 \;\textit{    }
\end{aligned}

And it renders beautifully formatted equations using markdown in the text cell.

enter image description here

What's nice, is now you have both the LaTeX code and the formatted output for your notebook!

Upvotes: 2

mikesneider
mikesneider

Reputation: 802

An alternative is to use it as markdown with githubusercontent (source) instead a codeline on Colab, add a text (markdown text) and then to use the next line. e.g.

<img src="https://render.githubusercontent.com/render/math?math=e^{i \pi} = -1">

enter image description here

Upvotes: 2

ijuneja
ijuneja

Reputation: 464

I came across this question unaware of the markdown cell way of rendering latex. So in case someone is looking for that ...

As an easier alternative, Latex can be rendered directly using the text cells feature of Google-colab notebooks.

For example, the following text when entered into a text cell renders as shown, A 

python notebook 

Equation 1
$$\frac{sin(x)}{x}$$

foo bar 

Equation 2
\begin{equation}
F(k) = \int_{-\infty}^{\infty} f(x) e^{2\pi i k} dx
\end{equation}

When rendered by colab, it becomes:

enter image description here

Upvotes: 7

user1301930
user1301930

Reputation: 191

You can get the Latex to render by including the MathJax library.

from IPython.display import Math, HTML
display(HTML("<script src='https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.3/"
               "latest.js?config=default'></script>"))

Math(r'F(k) = \int_{-\infty}^{\infty} f(x) e^{2\pi i k} dx')

A similar questions was asked here: Rendering LaTeX in output cells in Colaboratory

Upvotes: 9

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