Solved

Calculate area of sector

A=function(r,seta) r is radius of sector, seta is angle of sector, and A is its area. Area of sector A is defined as 0.5*(r^2...

1 month ago

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Rounding off numbers to n decimals

Inspired by a mistake in one of the problems I created, I created this problem where you have to round off a floating point numb...

1 month ago

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intersection of matrices

Given two matrices filled with ones and zeros, determine if they share a common row, column entry. These matrices are of identic...

1 month ago

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Check if number exists in vector

Return 1 if number _a_ exists in vector _b_ otherwise return 0. a = 3; b = [1,2,4]; Returns 0. a = 3; b = [1,...

1 month ago

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Return unique values without sorting

If the input vector A is [42 1 1], the output value B must be the unique values [42 1] The values of B are in the same order a...

1 month ago

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Generate N equally spaced intervals between -L and L

Given N and L, return a list of numbers (in ascending order) that divides the interval [-L L] into N equal-length segments. F...

1 month ago

Answered

I want to display negative temperature on channel view

Here are a few ways to get negative numbers into ThingSpeak or to plot them in MATLAB. https://api.thingspeak.com/update?api_ke...

I want to display negative temperature on channel view

Here are a few ways to get negative numbers into ThingSpeak or to plot them in MATLAB. https://api.thingspeak.com/update?api_ke...

1 month ago | 0

Solved

Getting the indices from a matrix

Inspired by Problem 645. Getting the indices from a matrix. Given a matrix A (or a vector), return the indices (always in row...

1 month ago

Answered

Is thingspeak free version account expire after one year

See the licensing FAQ. Free ThingSpeak licenses will renew yearly in the month you created the license assuming you meet the log...

Is thingspeak free version account expire after one year

See the licensing FAQ. Free ThingSpeak licenses will renew yearly in the month you created the license assuming you meet the log...

2 months ago | 0

Solved

Matlab Basics - Rounding III

Write a script to round a large number to the nearest 10,000 e.g. x = 12,358,466,243 --> y = 12,358,470,000

2 months ago

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Matlab Basics - Rounding II

Write a script to round a variable x to 3 decimal places: e.g. x = 2.3456 --> y = 2.346

2 months ago

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Check that number is whole number

Check that number is whole number Say x=15, then answer is 1. x=15.2 , then answer is 0. http://en.wikipedia.org/wiki/Whole_numb...

2 months ago

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MATLAB Basic: rounding IV

Do rounding towards plus infinity. Example: -8.8, answer -8 +8.1 answer 9 +8.50 answer 9

2 months ago

Solved

MATLAB Basic: rounding III

Do rounding towards minus infinity. Example: -8.8, answer -9 +8.1 answer 8 +8.50 answer 8

2 months ago

Solved

MATLAB Basic: rounding II

Do rounding nearest integer. Example: -8.8, answer -9 +8.1 answer 8 +8.50 answer 9

2 months ago

Solved

MATLAB Basic: rounding

Do rounding near to zero Example: -8.8, answer -8 +8.1 answer 8

2 months ago

Answered

App designer table handling

Thanks for showing the result Karol. Im taking your solution and adding it to the answers to help others find it. Solved by ...

App designer table handling

Thanks for showing the result Karol. Im taking your solution and adding it to the answers to help others find it. Solved by ...

2 months ago | 0

Answered

Can't send data to Thingspeak from Microbit DFRobot kit

Are you able to update the channel using the GET command in your browser address bar? Click on your channel view and use the A...

Can't send data to Thingspeak from Microbit DFRobot kit

Are you able to update the channel using the GET command in your browser address bar? Click on your channel view and use the A...

2 months ago | 0

Answered

Unable to write data by bulk update *csv method [ESP8266, Arduino framework]

I havent tested this recently, but I found it in an old folder and I expect that it works. I had to escape some values. Please ...

Unable to write data by bulk update *csv method [ESP8266, Arduino framework]

I havent tested this recently, but I found it in an old folder and I expect that it works. I had to escape some values. Please ...

2 months ago | 0

Answered

Unable to write data by bulk update *csv method [ESP8266, Arduino framework]

The arduino client should take care of url encoding your data. I would use the raw text in the value of char csv_feed Perhap...

Unable to write data by bulk update *csv method [ESP8266, Arduino framework]

The arduino client should take care of url encoding your data. I would use the raw text in the value of char csv_feed Perhap...

3 months ago | 0

Answered

How can I upload and plot temperature values that are both above zero (e.g., ambient) and below zero (e.g., in a freezer)?

I think the library answer seems best. Here is an example using the dallas one wire (that has some other dependancies built in ...

How can I upload and plot temperature values that are both above zero (e.g., ambient) and below zero (e.g., in a freezer)?

I think the library answer seems best. Here is an example using the dallas one wire (that has some other dependancies built in ...

3 months ago | 0

Answered

Will generating an alert API key reset the USER API key?

The alert API key and user API key are seperate. Genenrating an alert API key wil not change your user API key.

Will generating an alert API key reset the USER API key?

The alert API key and user API key are seperate. Genenrating an alert API key wil not change your user API key.

3 months ago | 0

| accepted

Answered

How to check DataPlugin in MATLAB

This pagedesribes how you can read MATLAB files into labview witha dataplugin and this answer describes some ways to import l...

How to check DataPlugin in MATLAB

This pagedesribes how you can read MATLAB files into labview witha dataplugin and this answer describes some ways to import l...

3 months ago | 0

Answered

HOW TO CLEAN NULL FROM MY GET QUERY

We reccomend using multiple channels to record your data in the case of multiple devices or sensors with different frequencies. ...

HOW TO CLEAN NULL FROM MY GET QUERY

We reccomend using multiple channels to record your data in the case of multiple devices or sensors with different frequencies. ...

3 months ago | 0

Answered

ThingSpeak Channel stopped receiving data since April 13th 2022

We strongly reccomend using the thingSpeak library for arduino and esp if possible. I dont see the problem directly. I would r...

ThingSpeak Channel stopped receiving data since April 13th 2022

We strongly reccomend using the thingSpeak library for arduino and esp if possible. I dont see the problem directly. I would r...

3 months ago | 0

Answered

Why arduino send data to thingspeak only once?

Your device will continue to send data once disconnected from the USB port, as long as it is powered and within the WiFi range. ...

Why arduino send data to thingspeak only once?

Your device will continue to send data once disconnected from the USB port, as long as it is powered and within the WiFi range. ...

3 months ago | 0

Answered

Thingspeak REST API READ results in data from wrong timezone

Check out the timezone and offset parameters in the read data endpoint.

Thingspeak REST API READ results in data from wrong timezone

Check out the timezone and offset parameters in the read data endpoint.

4 months ago | 0

Answered

MQTT via esp8266 suddenly stopped connecting giving mqttClient.state() = -2 error!?

ThingSpeak recently updated the security certificate. Can you try reprogamming with the new cert? The ESP8266 MQTT example co...

MQTT via esp8266 suddenly stopped connecting giving mqttClient.state() = -2 error!?

ThingSpeak recently updated the security certificate. Can you try reprogamming with the new cert? The ESP8266 MQTT example co...

4 months ago | 0

| accepted

Answered

In thingspeak , how can I visualize two or more channels on one page so I can view different fields from different nodes at a time ?

In the tabs on the top of the ThingSpeak site, Click on Apps > MATLAB Visualizations then click the green 'New' button, and you ...

In thingspeak , how can I visualize two or more channels on one page so I can view different fields from different nodes at a time ?

In the tabs on the top of the ThingSpeak site, Click on Apps > MATLAB Visualizations then click the green 'New' button, and you ...

4 months ago | 1

Answered

The graph couldn't be seen on the chart although the code ha been run correctly

We strongly reccomend using the ThingSpeak library for arduino, it takes care of a lot of code issues for you. Troubleshooting ...

The graph couldn't be seen on the chart although the code ha been run correctly

We strongly reccomend using the ThingSpeak library for arduino, it takes care of a lot of code issues for you. Troubleshooting ...

4 months ago | 0

| accepted