13 years, 9 days

## Intersection of datapoints with x-axis a...

Maple 2015

Hello! with the datapoints below I've calulated the results "manually"
I'm looking for a way to make Maple tell me the intersection of these datapoints with the x-axis and also, the area under it from e.g. 0 to 5.125, which i've also had to calculate by hand... I know I can use int comand to do this, but I think there is a lot wrong with the syntax, so after hours of failure I hope someone can show me the right commands..

Thanks,
krismalo

 =       The intersection of this plot with the x-axis should be ≈ 5.125 and the area from 0 to 5.125 (or from 5.125 to 10) should be ≈ 13810

## Can't multiply???...

Maple 2015

Hello!

I'm trying to plt something, I can't see why Maple isn't multiplying these two rows as it should.

Can anyone see the problem?

restart;

with(Units[Standard]);
with(ArrayTools);

with(LinearAlgebra);

with(Statistics);
with(plots);
with(CurveFitting);

 (1)

Thank you!

## Comma as decimal separator...

Maple 2015

As you can see on the picture, the numeric formatting is set to enginnering with 3 decimals, but it is now separated with a comma, so when I copy this answer to further calculate something, it will read it as a list, and it will give an error.

I have no Idea how this suddenly changed, its usually a period and there is no problem.

This is probably an asy fix, but I can't find any options for this.

Im running windows 10, and Im in Denmark.

## Problem with system in two unkowns...

Maple 15

Hello guys and gals!

I'm not strong enough with maple to get what the result I want.

It seems that it's because I'm asking for two lenths, and not a lenth and an angle, but I have no Idea how to tackle it diferently.

If you know a trick, please share it!

Here's an image:

http://imgur.com/xavAUoB

And here's the maple file attached (I think)

Thanks,

Happy new year!

## How to solve this equation?...

Maple 2015

Hello!

If I type this into a CAS calculator from Texas, I get the right result for Uc wich is 545.2.

solve(Uc&angle;-90=400&angle;X-150&angle;0+j*174.4,Uc,X)

This is used in AC circuits.

However, in Maple I'm using polar coordinates, so Im using this preamble:

phasor := proc (r, theta) options operator, arrow; r*cos(convert(theta*degrees, radians))+I*r*sin(convert(theta*degrees, radians)) end proc

This basically means that I can write phasor(value,angle in degrees) and get the lenth and angle of a vector on the complex plane.

Basically I want to know how I can make Maple solve this:

evalf(solve({phasor(U__C, -90) = phasor(400, X)-phasor(150, 0)+phasor(174.4, 90)}, {Uc, X})) Where I'm just interested in U_C , X doesn't matter.

I can't figure out how to do this with my current preamble. Does anyone know how to make this work?

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