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I looked through all issues and the docs, but I couldn't find an answer to my question. const config = {
number: "BigNumber",
precision: 79,
};
const math = create({ expDependencies }, config);
const mbn = this.math.bignumber!;
function exp(x: string): string {
const result = mbn(x).exp() as BigNumber;
console.log(result.toString());
}
exp("-1");The code above logs the following: 0.3678794411714423215955237701614608674458111310317678345078368016974614957448998"Now, I would like to truncate the result to 18 digits after the dot. How can I do that? I looked at the format function but it seems like the maximum numbers of digits permitted is 16. |
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Replies: 2 comments 2 replies
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I found the answer myself. math.js is built on top of decimal.js, which has a toFixed method. It is similar to the vanilla Thus I would rewrite the example like this: function exp(x: string): string {
const result = mbn(x).exp() as BigNumber;
console.log(result.toFixed(18));
}And get this in the console: |
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There is a powerful function https://mathjs.org/docs/reference/functions/format.html Your example would look like: function exp(x: string): string {
const result = mbn(x).exp() as BigNumber;
console.log(math.format(result, { notation: 'fixed', precision: 18 }));
} |
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Thanks for the tip! I think that the docs should be updated .. it says that the maximum precision that can be set is 16. |
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Ah, you're right. Updated via e6f3123 |
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I found the answer myself. math.js is built on top of decimal.js, which has a toFixed method. It is similar to the vanilla
toFixedavailable in JavaScript, but it can be used only with decimal.js instances.Thus I would rewrite the example like this:
And get this in the console: