Displaying Full Precision of Latitude Value in MATLAB Structure without Double-Clicking

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YoungMin
YoungMin 2024-4-29
回答： Vatsal 2024-5-7
I am retrieving JSON data from an API using the webread function in MATLAB. The data is stored in a structure called result, and I am specifically interested in the Latitude field within the result.AddressInfo structure.
The issue I am facing is that when I view the value of result.AddressInfo.Latitude in the MATLAB workspace, it is displayed with limited precision, showing only up to 4 decimal places (e.g., 46.3746). However, the actual value stored in the structure has more decimal places.
I can view the full precision of the latitude value by double-clicking on the value in the workspace, but I would like to find a way to display the full precision without the need for double-clicking.
Here's a simplified version of my code:
clc
clear all
close all
key = '6f456ccb-e90e-4633-b78c-9402b1bc106d';
base_url = 'https://api.openchargemap.io/v3/poi/?';
row = 1;
num_row = string(row);
country = 'HU';
url_iter = strcat(base_url, "&countrycode=", country, "&maxresults=", num_row, "&key=", key);
options = weboptions('ContentType', 'json', 'Timeout', 60);
options.ArrayFormat = 'json';
options.MediaType = 'application/json';
result = webread(url_iter, options);
I have tried using the format long and format long g commands, but they do not seem to affect the display of the structure fields.
Is there a way to configure MATLAB to display the full precision of the latitude value in the structure without the need for double-clicking?
Although the issue can be resolved by double-clicking on the value, it becomes a significant inconvenience for me as I am working with a large number of structures. The need to double-click on each value to view the full precision adds a considerable amount of manual effort to my workflow.
Any guidance or suggestions on how to display the full precision of the latitude value in the structure without the need for double-clicking would be greatly appreciated. Thank you in advance!
Best reagards
YoungMin

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回答（1 个）

Vatsal
Vatsal 2024-5-7
Hi,
To display the full precision of a 'result.AddressInfo.Latitude' value in the MATLAB workspace, there are two effective methods which can be followed:
Method 1: Using 'fprintf' for Full Precision Display
Utilize the 'fprintf' function to format and output the value directly. This is particularly useful when aiming to display the latitude value with a high degree of decimal precision.
The command below demonstrates how to achieve this with 15 decimal places:
fprintf('Latitude: %.15f\n', result.AddressInfo.Latitude);
This will print the 'result.AddressInfo.Latitude' value to the MATLAB Command Window with 15 decimal places.
Method 2: Converting 'result.AddressInfo.Latitude' Value to String with Specified Precision
Alternatively, the 'result.AddressInfo.Latitude' value can be converted into a string with a predefined precision level using the 'sprintf' function.
latitudeStr = sprintf('%.15f', result.AddressInfo.Latitude);
This method generates a string 'latitudeStr' that can be used in the MATLAB scripts to display or further process.
I hope this helps!

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