Hi Arnaud, Thanks for your answer. I tried directly with Google Charts and, indeed, I had the same error. So, the issue is not owing to xwiki but to Google Charts. In fact, I discovered that Google Charts has a maximum formula length of 200 characters. Perhaps someone could add it to the documentation of Formula Macro. Because, when we exceed this maximum with {formula} macro, nothing tells us that we switch on SnuggleTex renderer. Marine.
Hello,
I known nothing about Tex, but did you try your formula directly with Google Charts with some tools like curl or made a test page based on http://code.google.com/intl/fr/apis/chart/docs/post_requests.html When you are able to made it directly, then you can retry with {formula} macro.
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